Judgement Briefs

Evidence Law

Selvi v. State of Karnataka

(2010) 7 SCC 263

Citation
(2010) 7 SCC 263
Court
Supreme Court of India
Date
5 May 2010
Bench
K.G. Balakrishnan CJI, R.V. Raveendran and J.M. Panchal JJ.

Facts

  • A group of criminal appeals challenged court orders allowing investigating agencies to conduct:
  • narcoanalysis;
  • polygraph examinations;
  • Brain Electrical Activation Profile tests, commonly called brain mapping.
  • The proposed subjects included:
  • accused persons;
  • suspects;
  • witnesses.
  • In narcoanalysis:
  • drugs such as sodium pentothal are administered;
  • inhibitions are reduced;
  • the subject is encouraged to speak while in an altered state.
  • Polygraph examinations record physiological responses while questions are asked.
  • BEAP tests measure electrical brain responses to determine familiarity with particular information.
  • Investigating authorities argued that these techniques:
  • would assist difficult investigations;
  • were less harmful than physical coercion;
  • could produce useful investigative leads;
  • need not themselves be used as trial evidence.
  • The subjects argued that involuntary testing violated:
  • Article 20(3);
  • personal liberty under Article 21;
  • mental privacy;
  • bodily integrity;
  • the right to a fair investigation and trial.
  • Doubts were also raised about the scientific reliability of the techniques.

Issue

  • Whether involuntary administration of the tests amounts to testimonial compulsion.
  • Whether Article 20(3) applies during investigation and to suspects as well as formally charged accused.
  • Whether such testing violates Article 21, privacy and bodily integrity.
  • Whether test results or discoveries made from them are admissible.

Rule

  • Article 20(3) protects an accused against compelled testimonial self-incrimination.
  • The protection applies at the investigation stage and is not confined to testimony in court.
  • Testimonial evidence includes involuntary methods which extract or reveal the subject’s personal knowledge.
  • It is not limited to ordinary spoken answers.
  • Narcoanalysis, polygraph and BEAP results involve the use of the subject’s mental processes to draw conclusions about relevant facts.
  • They are different from physical evidence such as:
  • fingerprints;
  • blood samples;
  • handwriting specimens.
  • Involuntary administration also violates Article 21 by interfering with:
  • mental privacy;
  • bodily integrity;
  • human dignity;
  • protection against cruel, inhuman or degrading treatment;
  • trial fairness.
  • Voluntary testing may be conducted only with informed consent and prescribed safeguards.
  • Even where a test is voluntary, the actual test results are not automatically substantive evidence.
  • A material fact independently discovered as a result may be admissible under the discovery rule, subject to voluntariness and other evidentiary requirements.

Application

  • The Court rejected the argument that only verbal answers are testimonial.
  • A polygraph response or brain-activation pattern may communicate familiarity, recognition or deception derived from the subject’s mind.
  • Such responses disclose personal knowledge and therefore possess a testimonial character.
  • Narcoanalysis was even more directly testimonial because the drug induces verbal revelations while reducing conscious control.
  • The Court emphasised that lack of conscious control does not make the revelation voluntary.
  • It instead increases the compulsion.
  • These techniques also produce unreliable results:
  • narcoanalysis may generate fantasies, suggestions or false information;
  • polygraph readings can be affected by anxiety and physiological differences;
  • BEAP may show familiarity without proving participation in a crime.
  • Using such uncertain material may prejudice:
  • the presumption of innocence;
  • the right to challenge prosecution evidence;
  • the fairness of the trial.
  • The State’s duty to investigate efficiently could not justify forcing entry into a person’s mental processes.
  • Investigators must ordinarily build their case through independent efforts.
  • The Court distinguished Kathi Kalu Oghad.
  • Fingerprints and handwriting are external physical characteristics.
  • The impugned tests attempted to extract the subject’s personal knowledge and mental responses.
  • Consent had to be genuine and informed.
  • Judicial authorisation alone could not replace the individual’s consent.
  • Where voluntary testing is permitted, safeguards laid down by the National Human Rights Commission must be followed.

Conclusion

  • The Supreme Court held that involuntary narcoanalysis, polygraph and BEAP testing is unconstitutional.
  • It violates:
  • Article 20(3);
  • substantive due process under Article 21;
  • mental privacy;
  • bodily integrity.
  • No individual, whether accused, suspect or witness, may be forcibly subjected to these techniques.
  • Voluntary tests require informed consent and procedural safeguards.
  • The test results themselves do not automatically become admissible substantive evidence.
  • Independently discovered material may be considered only under ordinary evidence rules and where voluntariness is established.