Abstract
Upholding the Sanctity of Personal Liberty and the “Right Against Self-Incrimination” in the Face of Evolving Investigative Techniques. The Supreme Court of India, in the landmark judgment of Selvi & Ors. v. State of Karnataka[2], addressed the contentious issue of the involuntary administration of certain scientific techniques – namely, “narcoanalysis”, “polygraph examination”, and “Brain Electrical Activation Profile (BEAP) test” – for the purpose of criminal investigation.
This case, arising from a batch of criminal appeals,[3] delves deep into the fundamental rights enshrined in the Constitution of India, particularly Article 20(3)[4] (the right against self-incrimination) and Article 21[5] (the right to life and personal liberty), and their interplay with the evolving landscape of forensic science and criminal procedure. The Court’s pronouncement in Selvi[6] not only clarifies the constitutional boundaries of investigative practices but also underscores the sacrosanct nature of an individual’s mental privacy and the principles of fair trial within the Indian legal framework.
Facts of the Case
The genesis of this case lies in the increasing use of narcoanalysis, polygraph examinations, and BEAP tests by investigating agencies in India, often without the explicit consent of the individuals subjected to these procedures. These techniques were employed on accused persons, suspects, and even witnesses during the investigation stage of criminal cases, purportedly to gather information, strengthen investigation efforts, and uncover leads that might not be accessible through conventional interrogation methods.
The appeals before the Supreme Court arose from various instances where individuals were either forcibly subjected to these tests or faced the prospect of such involuntary administration. The core factual matrix revolved around the legality and constitutionality of compelling individuals involved in criminal investigations to undergo these scientific procedures.
Nature of the Techniques Used
The Court noted that these techniques involve distinct procedures:
| Technique | Description |
|---|---|
| Narcoanalysis | This involves the intravenous administration of a sodium amytal solution (a barbiturate) to induce a hypnotic or semi-conscious state in the subject. In this state, the subject’s inhibitions are supposedly lowered, making them more likely to divulge information. |
| Polygraph Examination | This involves the recording of physiological responses such as blood pressure, heart rate, respiration, and skin conductivity while the subject is asked a series of questions. Deception is inferred from specific patterns in these physiological responses. |
| Brain Electrical Activation Profile (BEAP) Test | This neuroscientific technique measures the electrical activity in the brain in response to stimuli, such as crime-related information. The presence of specific brainwave patterns, like the P300 wave, is interpreted as indicating familiarity with the information presented. |
The crucial factual element that influenced the Court’s reasoning was the involuntary nature of the administration of these tests in many instances. The investigating agencies often sought court orders to compel individuals to undergo these procedures, even without their informed consent.
Arguments by Proponents of These Techniques
- They aided in efficient investigation and helped discover crucial evidence.
- They served as a softer alternative to traditional “third-degree methods”.
- The information obtained was supposedly for investigation only and not directly admissible as evidence in court.
Issue
The Supreme Court identified two primary legal questions that needed to be answered to resolve the appeals:
- Whether the investigative use of these techniques “narcoanalysis, polygraph examination, and BEAP test” creates a likelihood of incrimination for the subject, thereby attracting the bar of Article 20(3)[7] of the Constitution of India (the right against self-incrimination)?
This issue focused on whether the information elicited during these tests could be considered “testimonial” in nature and whether its compulsory extraction would violate the constitutional protection against being compelled to be a witness against oneself.
- Whether the involuntary administration of the impugned techniques is a reasonable restriction on ‘personal liberty’ as understood in the context of Article 21[8] of the Constitution of India (the right to life and personal liberty)?
This issue examined whether the forced subjection to these procedures constituted an unwarranted intrusion into an individual’s personal liberty, considering aspects such as:
- Mental privacy
- The right against cruel, inhuman, or degrading treatment
- The right to a fair trial
These two core issues encapsulate the central dispute between the parties: the appellants argued that the involuntary use of these techniques violated their fundamental rights, while the respondents contended that they were necessary tools for effective investigation and did not contravene constitutional safeguards.
Rules
To adjudicate upon the issues raised, the Supreme Court relied on a comprehensive set of legal principles, statutes, and precedents:
Constitutional Provisions
- Article 20(3)[9] of the Constitution of India: This fundamental right guarantees that “No person accused of any offence shall be compelled to be a witness against himself.” The Court had to determine the scope of “witness against himself” and whether it extended to the involuntary administration of the impugned scientific techniques during investigation.
- Article 21[10] of the Constitution of India: This article guarantees the right to life and personal liberty, stating that “No person shall be deprived of his life or personal liberty except according to procedure established by law.” The Court considered whether the involuntary administration of these techniques violated the broader concept of personal liberty, including the right to privacy, the right against cruel, inhuman, or degrading treatment, and the right to a fair trial.
Statutory Provisions
| Statutory Reference | Key Point Considered by the Court |
|---|---|
| Section 161(2)[11] of the Code of Criminal Procedure, 1973[12] (CrPC) | Person examined during investigation is not bound to answer questions that may expose them to a criminal charge. The Court examined its relationship with Article 20(3). |
| Section 27[13] of the Indian Evidence Act, 1872[14] | Allows admissibility of information leading to the discovery of a relevant fact. The Court examined whether such information obtained involuntarily through impugned techniques could fall within this provision. |
Precedents on Article 20(3)
- M.P. Sharma v. Satish Chandra [15]: Established a broad interpretation of “testimonial compulsion” under Article 20(3), extending beyond oral evidence in court to include the compulsion to furnish evidence.
- State of Bombay v. Kathi Kalu Oghad [16]: Distinguished between “testimonial acts” involving the communication of personal knowledge and “physical evidence” such as fingerprints or bodily substances, holding that the latter did not fall within the ambit of Article 20(3) when used for identification or comparison. This case was a crucial reference point for the Court’s analysis.
- Nandini Satpathy v. P.L. Dani [17]: Affirmed that the protection of Article 20(3) extends to the investigation stage and includes any furnishing of information likely to have an incriminating impact.
- Ernesto Miranda v. Arizona [18]: A United States Supreme Court case highlighting the right to remain silent during custodial interrogation and the requirement of informing the accused of their rights. While not directly binding, it influenced the Court’s understanding of the right against self-incrimination in the investigative context.
Precedents on Article 21
- Kharak Singh v. The State of U.P [19]: Initially adopted a narrower view of personal liberty but subsequent cases expanded its scope to include the right to privacy.
- Maneka Gandhi v. Union of India [20]: Broadened the interpretation of “personal liberty” under Article 21 and introduced the requirement of “reasonableness” and “fairness” in any procedure restricting it.
- Rochin v. California [21]: Established the principle that state action in obtaining evidence should not “shock the conscience” and should adhere to the principles of due process.
- D.K. Basu v. State of West Bengal [22]: Emphasized the importance of preventing cruel, inhuman, or degrading treatment of persons in custody and laid down guidelines for custodial interrogation.
International Conventions
The Court also took note of international human rights norms, such as:
- Article 14(3)(g)[23] of the “International Covenant on Civil and Political Rights”[24] (ICCPR)
- Article 6[25] of the “European Convention for the Protection of Human Rights and Fundamental Freedoms”[26]
These guarantee the “right not to be compelled to testify against oneself” and the “right to a fair trial”.
Principles of Statutory Interpretation
The Court also considered the principle of ejusdem generis in interpreting the Explanation to Sections 53[27], 53-A[28], and 54[29] of the CrPC, which deals with medical examination of arrested persons.
Analysis:
The Supreme Court engaged in a detailed analysis of the nature of the impugned techniques and their implications for the fundamental rights of individuals.
Article 20(3) and the Right Against Self-Incrimination
Regarding Article 20(3) and the Right Against Self-Incrimination: The Court meticulously examined the precedent laid down by the Kathi Kalu Oghad[30], which distinguished between testimonial acts and physical evidence. It acknowledged that the prohibition under Article 20(3)[31] primarily targets the compulsion of oral or written statements that convey the personal knowledge that a person has regarding relevant facts, which could incriminate them.
Testimonial Acts vs Physical Evidence
| Concept | Description from Text |
|---|---|
| Testimonial acts | Oral or written statements conveying personal knowledge |
| Physical evidence distinction | Distinction recognized in Kathi Kalu Oghad |
However, the Court moved beyond a strict application of this distinction to the impugned techniques. It reasoned that while the physiological responses recorded during a polygraph or the brainwave patterns in a BEAP test might not be conscious statements, they are elicited through a process that compels the individual to respond to stimuli and are interpreted to reveal information that the individual possesses. Similarly, in narcoanalysis, although the subject is in a semi-conscious state, the information revealed is still a product of their cognitive processes and personal knowledge, albeit with lowered inhibitions.
Personal Testimony
Crucially, the Court held that the results of these tests are akin to “personal testimony” because they are derived from the subject’s mental processes and are used to draw inferences about their knowledge and involvement in a crime. Compelling an individual to undergo these tests, therefore, amounts to compelling them to be a witness against themselves, as the information obtained could “furnish a link in the chain of evidence” which is required for prosecution.
The Court rejected the argument that the results were solely for investigation and not admissible as evidence. It emphasized that even if the test results themselves were not directly admitted, any information or material subsequently discovered based on those involuntary tests would still be tainted by the initial compulsion, thereby indirectly violating Article 20(3)[32]. However, the Court made a crucial exception: information or material discovered as a result of voluntarily administered tests could be admissible under Section 27[33] of the Evidence Act, provided strict safeguards are followed.
Rule Against Adverse Inferences From Silence
The Court also highlighted the importance of the “rule against adverse inferences from silence”, which is operative at the trial stage and rooted in Article 20(3). Permitting the involuntary extraction of information during investigation would undermine this principle.
Article 21 and the Right to Personal Liberty
Regarding Article 21 and the Right to Personal Liberty: The Court further held that the involuntary administration of these techniques constitutes an unjustified intrusion into an individual’s mental privacy and bodily integrity, violating the fundamental right to personal liberty under Article 21.[34] It emphasized that the concept of personal liberty is not limited to mere physical confinement but encompasses a broader spectrum of rights, including the right to privacy, mental integrity, and dignity.
Mental Autonomy and Self-Determination
Drawing on the “substantive due process” element inherent in Article 21, the Court reasoned that the forcible subjection to these procedures, even in the absence of physical harm, amounts to “cruel, inhuman or degrading treatment” by interfering with an individual’s mental autonomy and self-determination. It noted the potential for psychological coercion and the lack of conscious control over responses during these tests.
Collection of Physical Evidence Distinguished
The Court distinguished the present case from instances where the collection of physical evidence like blood samples was permitted. It reasoned that while such procedures involve physical intrusion, they do not directly elicit testimonial responses rooted in the subject’s personal knowledge in the same way as the impugned techniques.
Reliability Concerns and Media Misuse
The Court also raised concerns about the reliability and scientific validity of these techniques in definitively establishing guilt or innocence. Relying heavily on such potentially unreliable methods could undermine the fairness of the trial.
Furthermore, the Court acknowledged the potential for misuse and abuse of these techniques by investigating agencies, including the possibility of coercion, manipulation, and the leaking of sensitive information to the media, leading to undue stigma and “trial by media”.
Guidelines for Voluntary Administration
While prohibiting the involuntary administration of these techniques, the Court recognized that they could be used in a voluntary setting, provided stringent safeguards are in place to ensure informed consent and protect the rights of the individual. The Court adopted the guidelines[35] formulated by the “National Human Rights Commission” (NHRC) and mandated that similar safeguards should be adopted for conducting such tests, emphasizing that:
| Guideline | Description |
|---|---|
| 1. | The subject must be fully informed about the nature, purpose, and potential consequences of the test by the police and their lawyer. |
| 2. | The subject must have access to a lawyer before consenting to the test. |
| 3. | The consent must be recorded before a Judicial Magistrate. |
| 4. | During the hearing before the Magistrate, the person should be represented by a lawyer. |
| 5. | The person must be clearly told that the statement made will not be a “confessional” statement to the Magistrate but will have the status of a statement made to the police. |
| 6. | The Magistrate must consider all factors relating to the detention, including its length. |
The Court reiterated that even with voluntary consent, the test results by themselves cannot be admitted as evidence because the subject does not exercise conscious control over the responses during the test. However, any information or material subsequently discovered with the help of voluntarily administered test results can be admitted in accordance with Section 27[36] of the Evidence Act.
Conclusion
In a definitive pronouncement safeguarding fundamental rights, the Supreme Court of India held that the involuntary administration of narcoanalysis, polygraph examination, and BEAP test is unconstitutional and violates Article 20(3)[37] of the Constitution (the right against self-incrimination) and Article 21[38] of the Constitution (the right to life and personal liberty).
The Court ruled in favor of the appellants, affirming the sanctity of an individual’s mental privacy and the right to choose between speaking and remaining silent, even during the investigation stage. While acknowledging the potential utility of these techniques in criminal investigation, the Court unequivocally prioritized the fundamental rights of individuals over the expediency of investigation when compulsion is involved.
The judgment in Selvi stands as a significant milestone in Indian constitutional jurisprudence, reinforcing the importance of fair and just investigative procedures that respect the dignity and autonomy of individuals. It clarifies the constitutional limitations on the use of modern scientific techniques in criminal investigation and underscores the enduring relevance of the “Right against self-incrimination” and the protection of personal liberty of an individual in the face of evolving technologies. The Court’s emphasis on voluntary consent and the stringent safeguards required for the administration of these tests reflects a balanced approach, allowing for their potential use while ensuring the protection of fundamental rights.
Note
NOTE – Any inadvertent omission in citation is unintentional. The author welcomes communication from rightful claimants for due acknowledgement.
End Notes:
- 2010 (7) SCC 263
- Ibid
- Criminal appeal no. 1199 of 2006, 1471 of 2007 and 6711 of 2007
- Article 20(3) – “No person accused of any offence shall be compelled to be a witness against himself”.
- Article 21 – “Protection of life and personal liberty”
- Ibid at 1
- Ibid at 4
- Ibid at 5
- Ibid at 4
- Ibid at 5
- Section 161(2): Examination of witnesses by police
- Code of Criminal Procedure, 1973. Act no. 2 of 1974.
- Section 27: How much of information received from accused may be proved.
- Indian Evidence Act, 1872. Act no. 1 of 1872
- 1954 SCR 1077 at PP. 1087-1088
- 1962 3 SCR 10 at pp. 43-44
- 1978 2 SCC 424 at pp. 438-439
- 384 US 436 (1966)
- AIR 1963 SC 1295
- 1978 1 SCC 248
- 342 US 166 (1951)
- AIR 1997 SC 610
- Article 14(3)(g) – “Not to be compelled to testify against himself or to confess guilt”.
- International Covenant On Civil and Political Rights (Adopted 16 December 1966, entered into force on 23 March 1976)
- Article 6 – “Right to fair trial”
- European Convention for the Protection of Human Rights and Fundamental Freedoms, 1950 (entered into force on Sep 3, 1953)
- Section 53 – “Examination of accused by medical practitioner at the request of police officer”
- Section 53A – Examination of person accused of rape by medical practitioner
- Section 54A – Examination of arrested person by medical officer
- 1962 3 SCR 10
- Ibid at 13
- Ibid at 13
- Section 27 – How much of information received from accused may be proved.
- Ibid at 14
- Guidelines relating to administration of Polygraph Test (Lie detector test) on the accused (2000)
- Section 27 : How much of information received from accused may be proved.
- Ibid at 13
- Ibid at 14
Written By: Anurag Yadav – LLM (National Law University Delhi)

