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Police Reforms – SC directives, NPC, other committees reports

Supreme Court Guidelines on DNA Evidence in Criminal Cases

Why in the News?

The Supreme Court has issued guidelines in the Kattavellai @ Devakar v. State of Tamil Nadu Judgement to standardise DNA handling in criminal cases to prevent contamination and delays after evidence lapses in a major case.

Key Highlights of the Supreme Court Guidelines:

  • Case Context: It involved rape, murder, and robbery. Court flagged delays in Forensic Science Laboratory (FSL) submission, lack of chain of custody, and risk of contamination.
  • Need: Lack of uniform procedures across states despite scattered rules. Since Police and Public Order are in the State List, Supreme Court intervened for national uniformity.
  • Guidelines Issued:
    • Collection and Documentation: Samples must be packaged properly, labelled with FIR details, and signed by medical officer, Investigating Officer, and witnesses.
    • Transportation: Investigating Officer (IO) must deliver samples to FSL within 48 hours. Reasons for any delay must be recorded.
    • Storage Pending Trial: Packages cannot be opened or resealed without trial court approval.
    • Chain of Custody Register: Maintained until conviction or acquittal. IO responsible for explaining lapses.

Previous SC Observations on DNA Evidence:

  • Anil v. Maharashtra (2014): DNA reliable only if laboratory procedures are maintained.
  • Manoj v. Madhya Pradesh (2022): DNA rejected as recovery was from open area with contamination risk.
  • Rahul v. Delhi (2022): DNA held inadmissible after being kept in police custody for two months.
  • Pattu Rajan v. Tamil Nadu (2019): DNA value depends on corroborating evidence; absence not fatal.
  • Sharda v. Dharmpal (2003): DNA test orders valid; no violation of Article 21.
  • Das @ Anu v. Kerala (2022): DNA not self-incrimination under Article 20(3). Section 53A CrPC permits collection in rape cases.

Back2Basics: DNA Profiling

  • Overview: DNA profiling, also called DNA fingerprinting, is a forensic technique to identify individuals by analysing unique DNA regions, mainly Short Tandem Repeats (STRs).
  • How it works: Human DNA is 99.9% identical; the 0.1% variability forms the basis of personal identification.
  • Sources: DNA can be extracted from blood, semen, saliva, hair, bone, skin, or even “touch DNA.”
  • Processes: The process includes isolation, purification, amplification, visualization, and statistical comparison of DNA markers.
  • Methods:  miniSTRs and mitochondrial DNA (mtDNA) help in degraded or limited samples.
  • Legal Status: Treated as expert opinion under Indian Evidence Act Section 45 (now BSA 2023 Section 39). DNA is corroborative, not substantive evidence.

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