{"id":30096,"date":"2026-08-15T06:41:18","date_gmt":"2026-08-15T06:41:18","guid":{"rendered":"https:\/\/www.legalserviceindia.com\/Legal-Articles\/?p=30096"},"modified":"2026-08-15T06:47:44","modified_gmt":"2026-08-15T06:47:44","slug":"biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids","status":"publish","type":"post","link":"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/","title":{"rendered":"Biological Fluid Analysis: Forensic Examination of Blood, Saliva, Semen, and Other Body Fluids"},"content":{"rendered":"\n<h2 id=\"h-introduction\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Biological evidence plays a vital role in modern criminal investigations. It helps investigators identify victims, suspects, and unknown persons. Biological materials found at crime scenes often contain unique characteristics that can link a person to a crime. Common biological evidence includes blood, bones, saliva, hair, teeth, semen, urine, tissues, and DNA-containing body fluids.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0c0c0c;color:#0c0c0c\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #0c0c0c;color:#0c0c0c\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Introduction\" >Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#What_Is_Biological_Evidence\" >What Is Biological Evidence?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Common_Types_of_Biological_Evidence\" >Common Types of Biological Evidence<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_Through_Blood_Evidence\" >Identification Through Blood Evidence<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Information_Obtained_from_Blood\" >Information Obtained from Blood<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Determination_of_Human_or_Animal_Origin\" >Determination of Human or Animal Origin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Blood_Grouping\" >Blood Grouping<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#DNA_Profiling\" >DNA Profiling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Bloodstain_Pattern_Analysis\" >Bloodstain Pattern Analysis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_of_Victims\" >Identification of Victims<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_Through_Bone_Evidence\" >Identification Through Bone Evidence<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Information_Obtained_from_Bones\" >Information Obtained from Bones<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_of_Human_Remains\" >Identification of Human Remains<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Estimation_of_Age\" >Estimation of Age<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Determination_of_Sex\" >Determination of Sex<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Estimation_of_Height\" >Estimation of Height<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_of_Injuries\" >Identification of Injuries<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#DNA_Analysis\" >DNA Analysis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Personal_Identification\" >Personal Identification<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_Through_Saliva_Evidence\" >Identification Through Saliva Evidence<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Common_Sources_of_Saliva\" >Common Sources of Saliva<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Information_Obtained_from_Saliva\" >Information Obtained from Saliva<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#DNA_Profiling-2\" >DNA Profiling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Blood_Group_Determination\" >Blood Group Determination<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Linking_a_Suspect_to_a_Crime_Scene\" >Linking a Suspect to a Crime Scene<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Bite_Mark_Investigations\" >Bite Mark Investigations<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_Through_Hair\" >Identification Through Hair<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Information_Obtained_from_Hair\" >Information Obtained from Hair<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Human_or_Animal_Origin\" >Human or Animal Origin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Body_Area_Identification\" >Body Area Identification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#DNA_Analysis-2\" >DNA Analysis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Linking_Individuals\" >Linking Individuals<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_Through_Teeth_and_Dental_Evidence\" >Identification Through Teeth and Dental Evidence<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Information_Obtained_from_Teeth\" >Information Obtained from Teeth<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Personal_Identification-2\" >Personal Identification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Age_Estimation\" >Age Estimation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#DNA_Recovery\" >DNA Recovery<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Disaster_Victim_Identification\" >Disaster Victim Identification<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_Through_Semen_Evidence\" >Identification Through Semen Evidence<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Information_Obtained_from_Semen\" >Information Obtained from Semen<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Confirmation_of_Sexual_Contact\" >Confirmation of Sexual Contact<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#DNA_Profiling-3\" >DNA Profiling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Linking_Suspect_and_Victim\" >Linking Suspect and Victim<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Identification_Through_Urine_and_Other_Body_Fluids\" >Identification Through Urine and Other Body Fluids<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Examples\" >Examples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Importance\" >Importance<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#DNA_Profiling_The_Most_Powerful_Identification_Tool\" >DNA Profiling: The Most Powerful Identification Tool<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-48\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Sources_of_DNA\" >Sources of DNA<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-49\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Advantages_of_DNA_Profiling\" >Advantages of DNA Profiling<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-50\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Collection_and_Preservation_of_Biological_Evidence\" >Collection and Preservation of Biological Evidence<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-51\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Important_Precautions\" >Important Precautions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-52\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Importance_of_Biological_Evidence_in_Criminal_Investigation\" >Importance of Biological Evidence in Criminal Investigation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-53\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Comparative_Perspective_DNA_Databases_in_India_and_the_United_States\" >Comparative Perspective: DNA Databases in India and the United States<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-54\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n\n<p class=\"wp-block-paragraph\">In State of Maharashtra v. Mohan Kathwaru Chauhan (2022), the court relied on forensic DNA profiling of biological fluids\u2014specifically recovered semen and blood\u2014to conclusively establish the identity of the accused in a rape-and-murder case.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The scientific examination of biological evidence provides reliable and objective information that can assist courts in delivering justice.<\/p>\n\n\n\n<h2 id=\"h-what-is-biological-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_Biological_Evidence\"><\/span>What Is Biological Evidence?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Biological evidence refers to any material of biological origin that can be used for identification purposes. Such evidence may be found at crime scenes, on victims, suspects, weapons, clothing, vehicles, or other objects connected with an offense.<\/p>\n\n\n\n<h3 id=\"h-common-types-of-biological-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Types_of_Biological_Evidence\"><\/span>Common Types of Biological Evidence<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Biological Evidence<\/th><th>Common Investigative Use<\/th><\/tr><\/thead><tbody><tr><td>Blood<\/td><td>Identification and DNA profiling<\/td><\/tr><tr><td>Bones<\/td><td>Identification of human remains and DNA analysis<\/td><\/tr><tr><td>Saliva<\/td><td>DNA profiling and linking individuals to objects<\/td><\/tr><tr><td>Hair<\/td><td>Human or animal origin and DNA analysis<\/td><\/tr><tr><td>Teeth<\/td><td>Personal identification and DNA recovery<\/td><\/tr><tr><td>Semen<\/td><td>Identification and DNA profiling<\/td><\/tr><tr><td>Urine<\/td><td>DNA and drug or alcohol-related analysis<\/td><\/tr><tr><td>Skin cells<\/td><td>DNA identification<\/td><\/tr><tr><td>Nails<\/td><td>Biological and DNA evidence<\/td><\/tr><tr><td>Soft tissues<\/td><td>Identification and DNA analysis<\/td><\/tr><tr><td>Sweat<\/td><td>Biological and DNA evidence<\/td><\/tr><tr><td>DNA-containing body fluids<\/td><td>Identification and forensic analysis<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 id=\"h-identification-through-blood-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_Through_Blood_Evidence\"><\/span>Identification Through Blood Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Blood is one of the most important forms of biological evidence. Even a small blood stain can provide valuable information.<\/p>\n\n\n\n<h3 id=\"h-information-obtained-from-blood\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Information_Obtained_from_Blood\"><\/span>Information Obtained from Blood<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 id=\"h-determination-of-human-or-animal-origin\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Determination_of_Human_or_Animal_Origin\"><\/span>Determination of Human or Animal Origin<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Laboratory tests can determine whether the blood belongs to a human or an animal.<\/p>\n\n\n\n<h4 id=\"h-blood-grouping\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Blood_Grouping\"><\/span>Blood Grouping<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Blood can be classified into different groups, such as<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A<\/li>\n\n\n\n<li>B<\/li>\n\n\n\n<li>AB<\/li>\n\n\n\n<li>O<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Blood grouping can help narrow down the list of possible suspects.<\/p>\n\n\n\n<h4 id=\"h-dna-profiling\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNA_Profiling\"><\/span>DNA Profiling<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DNA extracted from blood provides highly accurate identification of individuals.<\/p>\n\n\n\n<h4 id=\"h-bloodstain-pattern-analysis\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bloodstain_Pattern_Analysis\"><\/span>Bloodstain Pattern Analysis<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The shape, size, and distribution of bloodstains can help investigators determine:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Direction of impact<\/li>\n\n\n\n<li>Position of victim and offender<\/li>\n\n\n\n<li>Type of weapon used<\/li>\n\n\n\n<li>Sequence of events<\/li>\n<\/ul>\n\n\n\n<h4 id=\"h-identification-of-victims\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_of_Victims\"><\/span>Identification of Victims<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Blood samples can be compared with known relatives to identify unknown victims.<\/p>\n\n\n\n<h2 id=\"h-identification-through-bone-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_Through_Bone_Evidence\"><\/span>Identification Through Bone Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bones are often recovered from decomposed, burned, buried, or skeletonized bodies.<\/p>\n\n\n\n<h3 id=\"h-information-obtained-from-bones\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Information_Obtained_from_Bones\"><\/span>Information Obtained from Bones<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 id=\"h-identification-of-human-remains\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_of_Human_Remains\"><\/span>Identification of Human Remains<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Experts can determine whether bones are human or animal.<\/p>\n\n\n\n<h4 id=\"h-estimation-of-age\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Estimation_of_Age\"><\/span>Estimation of Age<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Bone development and degeneration help estimate the age of a person.<\/p>\n\n\n\n<h4 id=\"h-determination-of-sex\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Determination_of_Sex\"><\/span>Determination of Sex<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The pelvis and skull provide important clues regarding whether the remains belong to a male or female.<\/p>\n\n\n\n<h4 id=\"h-estimation-of-height\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Estimation_of_Height\"><\/span>Estimation of Height<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The length of long bones such as the femur and tibia can help estimate stature.<\/p>\n\n\n\n<h4 id=\"h-identification-of-injuries\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_of_Injuries\"><\/span>Identification of Injuries<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Bones may show:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fractures<\/li>\n\n\n\n<li>Gunshot wounds<\/li>\n\n\n\n<li>Sharp force injuries<\/li>\n\n\n\n<li>Blunt force trauma<\/li>\n<\/ul>\n\n\n\n<h4 id=\"h-dna-analysis\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNA_Analysis\"><\/span>DNA Analysis<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DNA can often be extracted from bone marrow or dense bones even many years after death.<\/p>\n\n\n\n<h4 id=\"h-personal-identification\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Personal_Identification\"><\/span>Personal Identification<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Unique skeletal features, healed fractures, surgical implants, and dental records can help identify a person.<\/p>\n\n\n\n<h2 id=\"h-identification-through-saliva-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_Through_Saliva_Evidence\"><\/span>Identification Through Saliva Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Saliva is frequently found at crime scenes and can be a valuable source of DNA.<\/p>\n\n\n\n<h3 id=\"h-common-sources-of-saliva\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Sources_of_Saliva\"><\/span>Common Sources of Saliva<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cigarette butts<\/li>\n\n\n\n<li>Drinking glasses<\/li>\n\n\n\n<li>Bottles<\/li>\n\n\n\n<li>Chewing gum<\/li>\n\n\n\n<li>Bite marks<\/li>\n\n\n\n<li>Envelopes and stamps<\/li>\n\n\n\n<li>Food items<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-information-obtained-from-saliva\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Information_Obtained_from_Saliva\"><\/span>Information Obtained from Saliva<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 id=\"h-dna-profiling-0\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNA_Profiling-2\"><\/span>DNA Profiling<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Saliva contains cells from the mouth that provide DNA for identification.<\/p>\n\n\n\n<h4 id=\"h-blood-group-determination\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Blood_Group_Determination\"><\/span>Blood Group Determination<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Some individuals secrete blood group substances in saliva, which may assist investigations.<\/p>\n\n\n\n<h4 id=\"h-linking-a-suspect-to-a-crime-scene\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Linking_a_Suspect_to_a_Crime_Scene\"><\/span>Linking a Suspect to a Crime Scene<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Saliva found on objects can connect a person to a particular location or event.<\/p>\n\n\n\n<h4 id=\"h-bite-mark-investigations\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bite_Mark_Investigations\"><\/span>Bite Mark Investigations<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DNA from saliva around bite marks may help identify the person who caused the injury.<\/p>\n\n\n\n<h2 id=\"h-identification-through-hair\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_Through_Hair\"><\/span>Identification Through Hair<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hair is commonly transferred during physical contact between individuals.<\/p>\n\n\n\n<h3 id=\"h-information-obtained-from-hair\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Information_Obtained_from_Hair\"><\/span>Information Obtained from Hair<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 id=\"h-human-or-animal-origin\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Human_or_Animal_Origin\"><\/span>Human or Animal Origin<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Microscopic examination can determine whether hair is human or animal.<\/p>\n\n\n\n<h4 id=\"h-body-area-identification\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Body_Area_Identification\"><\/span>Body Area Identification<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Hair characteristics may indicate whether it came from:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Head<\/li>\n\n\n\n<li>Beard<\/li>\n\n\n\n<li>Chest<\/li>\n\n\n\n<li>Arm<\/li>\n\n\n\n<li>Public region<\/li>\n<\/ul>\n\n\n\n<h4 id=\"h-dna-analysis-0\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNA_Analysis-2\"><\/span>DNA Analysis<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Hair roots may contain DNA suitable for identification.<\/p>\n\n\n\n<h4 id=\"h-linking-individuals\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Linking_Individuals\"><\/span>Linking Individuals<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Hair found on clothing, furniture, or weapons may connect suspects and victims.<\/p>\n\n\n\n<h2 id=\"h-identification-through-teeth-and-dental-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_Through_Teeth_and_Dental_Evidence\"><\/span>Identification Through Teeth and Dental Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Teeth are among the most durable parts of the human body and often survive fire, decomposition, and disasters.<\/p>\n\n\n\n<h3 id=\"h-information-obtained-from-teeth\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Information_Obtained_from_Teeth\"><\/span>Information Obtained from Teeth<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 id=\"h-personal-identification-0\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Personal_Identification-2\"><\/span>Personal Identification<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Dental records can be compared with recovered remains.<\/p>\n\n\n\n<h4 id=\"h-age-estimation\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Age_Estimation\"><\/span>Age Estimation<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Tooth eruption and wear patterns help estimate age.<\/p>\n\n\n\n<h4 id=\"h-dna-recovery\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNA_Recovery\"><\/span>DNA Recovery<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DNA may be extracted from the pulp inside teeth.<\/p>\n\n\n\n<h4 id=\"h-disaster-victim-identification\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Disaster_Victim_Identification\"><\/span>Disaster Victim Identification<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Dental evidence is extensively used in mass disasters and accidents.<\/p>\n\n\n\n<h2 id=\"h-identification-through-semen-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_Through_Semen_Evidence\"><\/span>Identification Through Semen Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Semen is commonly encountered in sexual offense investigations.<\/p>\n\n\n\n<h3 id=\"h-information-obtained-from-semen\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Information_Obtained_from_Semen\"><\/span>Information Obtained from Semen<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 id=\"h-confirmation-of-sexual-contact\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Confirmation_of_Sexual_Contact\"><\/span>Confirmation of Sexual Contact<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Laboratory tests can identify the presence of semen.<\/p>\n\n\n\n<h4 id=\"h-dna-profiling-1\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNA_Profiling-3\"><\/span>DNA Profiling<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Sperm cells provide DNA for identifying suspects.<\/p>\n\n\n\n<h4 id=\"h-linking-suspect-and-victim\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Linking_Suspect_and_Victim\"><\/span>Linking Suspect and Victim<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DNA comparisons can establish associations between individuals involved in a crime.<\/p>\n\n\n\n<h2 id=\"h-identification-through-urine-and-other-body-fluids\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Identification_Through_Urine_and_Other_Body_Fluids\"><\/span>Identification Through Urine and Other Body Fluids<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Other body fluids may also serve as biological evidence.<\/p>\n\n\n\n<h3 id=\"h-examples\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Examples\"><\/span>Examples<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Urine<\/li>\n\n\n\n<li>Sweat<\/li>\n\n\n\n<li>Vaginal secretions<\/li>\n\n\n\n<li>Nasal secretions<\/li>\n\n\n\n<li>Faecal matter<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-importance\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Importance\"><\/span>Importance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">These materials may:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Provide DNA<\/li>\n\n\n\n<li>Indicate drug or alcohol use<\/li>\n\n\n\n<li>Link individuals to crime scenes<\/li>\n\n\n\n<li>Support reconstruction of events<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-dna-profiling-the-most-powerful-identification-tool\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNA_Profiling_The_Most_Powerful_Identification_Tool\"><\/span>DNA Profiling: The Most Powerful Identification Tool<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DNA profiling is the scientific analysis of genetic material present in biological samples.<\/p>\n\n\n\n<h3 id=\"h-sources-of-dna\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sources_of_DNA\"><\/span>Sources of DNA<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blood<\/li>\n\n\n\n<li>Saliva<\/li>\n\n\n\n<li>Bone<\/li>\n\n\n\n<li>Hair roots<\/li>\n\n\n\n<li>Teeth<\/li>\n\n\n\n<li>Semen<\/li>\n\n\n\n<li>Skin cells<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-advantages-of-dna-profiling\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advantages_of_DNA_Profiling\"><\/span>Advantages of DNA Profiling<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Extremely accurate<\/li>\n\n\n\n<li>Unique for every individual (except identical twins)<\/li>\n\n\n\n<li>Useful in identifying suspects and victims<\/li>\n\n\n\n<li>Effective even with very small samples<\/li>\n\n\n\n<li>Helpful in missing person investigations<\/li>\n\n\n\n<li>Assists in disaster victim identification<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-collection-and-preservation-of-biological-evidence\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Collection_and_Preservation_of_Biological_Evidence\"><\/span>Collection and Preservation of Biological Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Proper collection and preservation are essential to prevent contamination.<\/p>\n\n\n\n<h3 id=\"h-important-precautions\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Important_Precautions\"><\/span>Important Precautions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wear gloves and protective equipment.<\/li>\n\n\n\n<li>Use clean and sterile tools.<\/li>\n\n\n\n<li>Package each item separately.<\/li>\n\n\n\n<li>Allow wet samples to dry before packaging.<\/li>\n\n\n\n<li>Label and seal all exhibits properly.<\/li>\n\n\n\n<li>Maintain chain of custody.<\/li>\n\n\n\n<li>Store samples under suitable conditions.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-importance-of-biological-evidence-in-criminal-investigation\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Importance_of_Biological_Evidence_in_Criminal_Investigation\"><\/span>Importance of Biological Evidence in Criminal Investigation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Biological evidence helps investigators:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Identify suspects and victims.<\/li>\n\n\n\n<li>Establish links between persons, places, and objects.<\/li>\n\n\n\n<li>Reconstruct crime events.<\/li>\n\n\n\n<li>Exonerate innocent persons.<\/li>\n\n\n\n<li>Confirm or refute witness statements.<\/li>\n\n\n\n<li>Provide strong scientific evidence in court.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-comparative-perspective-dna-databases-in-india-and-the-united-states\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Comparative_Perspective_DNA_Databases_in_India_and_the_United_States\"><\/span>Comparative Perspective: DNA Databases in India and the United States<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DNA databases have become one of the most powerful tools in criminal investigation. They allow law enforcement agencies to compare unknown biological samples recovered from crime scenes against known offender profiles and unsolved case records.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the United States, the Combined DNA Index System (CODIS), maintained by the Federal Bureau of Investigation (FBI), serves as the national DNA database. CODIS operates at local, 108 state, and national levels, enabling investigators to connect offenders to multiple crime scenes across jurisdictions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CODIS uses Short Tandem Repeat (STR) analysis and allows matching through offender profiles, forensic unknowns, and missing persons databases. In some cases, familial searching may identify close biological relatives of an unknown contributor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">India has expanded its forensic DNA capabilities significantly through State Forensic Science Laboratories and Central Forensic Science Laboratories. The increasing development of national DNA infrastructure reflects the growing importance of DNA evidence in criminal investigations, disaster victim identification, and parentage disputes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While both countries recognize DNA as one of the most reliable forms of forensic evidence, legal and ethical concerns regarding privacy, data retention, and database expansion continue to remain subjects of debate worldwide.<\/p>\n\n\n\n<h2 id=\"h-conclusion\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Biological evidence such as blood, bones, saliva, hair, teeth, semen, and other body materials plays a crucial role in forensic investigations. Through scientific examination and DNA analysis, investigators can accurately identify individuals, establish connections between suspects and crime scenes, and provide reliable evidence before the court. Proper collection, preservation, and laboratory examination of biological evidence are essential for achieving justice and ensuring successful criminal investigations.<\/p>\n\n\n\n<ul class=\"wp-block-yoast-seo-related-links yoast-seo-related-links\">\n<li><a href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/forensic-hair-examination-collection-preservation-microscopic-analysis-dna-testing-and-evidentiary-value\/\">Forensic Hair Examination: Collection, Preservation, Microscopic Analysis, DNA Testing, and Evidentiary Value<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/forensic-anthropology-identifying-the-dead-through-bones-and-skeletal-remains\/\">Forensic Anthropology: Identifying the Dead through Bones and Skeletal Remains<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/dna-fingerprinting-molecular-identification-and-its-role-in-criminal-investigation\/\">DNA Fingerprinting: Molecular Identification and Its Role in Criminal Investigation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/degraded-dna-the-limits-of-detection\/\">Degraded DNA: The Limits of Detection<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/dna-testing-and-its-role-in-todays-legal-system\/\">DNA Testing and Its Role in Today\u2019s Legal System<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Biological evidence plays a vital role in modern criminal investigations. It helps investigators identify victims, suspects, and unknown persons. Biological materials found at crime scenes often contain unique characteristics that can link a person to a crime. Common biological evidence includes blood, bones, saliva, hair, teeth, semen, urine, tissues, and DNA-containing body fluids. In<\/p>\n","protected":false},"author":49,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"two_page_speed":[],"_jetpack_memberships_contains_paid_content":false,"_joinchat":[],"footnotes":""},"categories":[87],"tags":[921],"class_list":["post-30096","post","type-post","status-publish","format-standard","category-medico-legal","tag-medico-legal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Biological Fluid Analysis: Forensic Examination of Blood, Saliva, Semen, and Other Body Fluids - Legal Service India - Articles<\/title>\n<meta name=\"description\" content=\"Discover how biological evidence and DNA profiling help identify suspects, victims and crime-scene links in modern forensic investigations.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Biological Fluid Analysis: Forensic Examination of Blood, Saliva, Semen, and Other Body Fluids\" \/>\n<meta property=\"og:description\" content=\"Discover how biological evidence and DNA profiling help identify suspects, victims and crime-scene links in modern forensic investigations.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.legalserviceindia.com\/Legal-Articles\/biological-fluid-analysis-forensic-examination-of-blood-saliva-semen-and-other-body-fluids\/\" \/>\n<meta property=\"og:site_name\" content=\"Legal Service India - Articles\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/legalservicesind\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-15T06:41:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-15T06:47:44+00:00\" \/>\n<meta name=\"author\" content=\"Md. 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He served in Barrackpore Police Commissionerate, holding the positions of DCP (Special Branch) and DCP (Traffic) for over 4 years. He was posted in the districts of Dakshin Dinajpur and Nadia as Additional SP. At the sub-divisional level, he has worked as SDPOs of Gangarampur, Raghunathpur and Kalna sub-divisions of West Bengal. His tenure as Special IG and subsequently as IGP of Correctional Services, West Bengal, for over 4 years, saw him deeply engaged in improving the prison and correctional system. He visited numerous correctional homes across West Bengal, interacting with inmates, both male and female, including children residing with their incarcerated mothers. His outreach extended to correctional homes in Assam, Bihar, and Tripura. This hands-on approach provided him with invaluable insights into the workings of prisons and the complexities of the prisoner psyche. Beyond his operational roles, Md. Imran Wahab possesses a strong academic background, holding B.Sc., M.A., L.L.B., and M.B.A. degrees. He has also completed Post Graduate Diplomas in Human Rights, Project Management, Corporate Management, Computer Application, Public Administration, Medical Law, Disaster Management, Fire Safety &amp; Hazards Management and Psychology. He has attended Indian government sponsored specialized training in police and management matters in SVPNPA, Hyderabad, IIM, Ahmedabad and Singapore. He is the author of the books 'Police Investigation &amp; Allied Matters' and 'Alternative Dispute Resolution: Evolving Trends and Innovations' demonstrating his commitment to knowledge sharing within the law enforcement field. As an observer for the Election Commission of India, he has gained firsthand experience in conducting assembly elections and bye-elections in Uttar Pradesh, Rajasthan, Assam, Bihar, and Tripura (twice). 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Imran Wahab","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.legalserviceindia.com\/Legal-Articles\/wp-content\/uploads\/avatars\/49\/1777837060-bpfull.jpg","url":"https:\/\/www.legalserviceindia.com\/Legal-Articles\/wp-content\/uploads\/avatars\/49\/1777837060-bpfull.jpg","contentUrl":"https:\/\/www.legalserviceindia.com\/Legal-Articles\/wp-content\/uploads\/avatars\/49\/1777837060-bpfull.jpg","caption":"Md. Imran Wahab"},"description":"Md. Imran Wahab, a distinguished 2004-batch Indian Police Service officer, has dedicated over 32 years to public service, holding various senior managerial positions within the West Bengal Police force. His career has spanned diverse roles across different districts, including Kolkata Police, serving as DCP, 5th Battalion, Kolkata Armed Police and DCP (Port Division), for approximately 4 years. He served in Barrackpore Police Commissionerate, holding the positions of DCP (Special Branch) and DCP (Traffic) for over 4 years. He was posted in the districts of Dakshin Dinajpur and Nadia as Additional SP. At the sub-divisional level, he has worked as SDPOs of Gangarampur, Raghunathpur and Kalna sub-divisions of West Bengal. His tenure as Special IG and subsequently as IGP of Correctional Services, West Bengal, for over 4 years, saw him deeply engaged in improving the prison and correctional system. He visited numerous correctional homes across West Bengal, interacting with inmates, both male and female, including children residing with their incarcerated mothers. His outreach extended to correctional homes in Assam, Bihar, and Tripura. This hands-on approach provided him with invaluable insights into the workings of prisons and the complexities of the prisoner psyche. Beyond his operational roles, Md. Imran Wahab possesses a strong academic background, holding B.Sc., M.A., L.L.B., and M.B.A. degrees. He has also completed Post Graduate Diplomas in Human Rights, Project Management, Corporate Management, Computer Application, Public Administration, Medical Law, Disaster Management, Fire Safety &amp; Hazards Management and Psychology. He has attended Indian government sponsored specialized training in police and management matters in SVPNPA, Hyderabad, IIM, Ahmedabad and Singapore. He is the author of the books 'Police Investigation &amp; Allied Matters' and 'Alternative Dispute Resolution: Evolving Trends and Innovations' demonstrating his commitment to knowledge sharing within the law enforcement field. As an observer for the Election Commission of India, he has gained firsthand experience in conducting assembly elections and bye-elections in Uttar Pradesh, Rajasthan, Assam, Bihar, and Tripura (twice). This exposure has given him a deep understanding of election management and the Election Commission's operations. 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