Dna And Fingerprint Analysis
1. Introduction
Forensic science plays a crucial role in criminal investigations, especially in identifying perpetrators. Two of the most reliable techniques are:
Fingerprint Analysis:
Based on the unique patterns of ridges on human fingertips.
Used to identify individuals with high accuracy.
DNA Analysis (Deoxyribonucleic Acid):
DNA is unique for each individual, except identical twins.
Can be extracted from blood, hair, saliva, semen, or other biological materials.
Helps in identifying perpetrators, victims, or familial relationships.
Significance in law:
Both methods have been widely recognized in India and other jurisdictions as scientific evidence admissible in court.
2. Legal Basis in India
Indian Evidence Act, 1872:
Section 45: Expert opinion, including forensic and DNA evidence, is admissible.
Courts treat DNA and fingerprints as opinion evidence given by experts.
DNA Technology (Use and Application) Regulation Act, 2019:
Establishes legal framework for collection, storage, and use of DNA in criminal cases.
Fingerprint Analysis:
Admissible under Section 45 as expert evidence.
Criminal Procedure Code allows search, seizure, and collection of fingerprints during investigation.
3. Principles of Forensic Analysis
Fingerprint Analysis:
No two fingerprints are alike.
Pattern matching includes loops, whorls, and arches.
Expert witnesses compare latent prints from crime scenes with suspects’ fingerprints.
DNA Analysis:
Relies on short tandem repeats (STRs) or genetic markers.
Matches are statistically evaluated.
Considered highly reliable if collection, handling, and testing follow standard procedures.
4. Case Laws on DNA and Fingerprint Analysis
Case 1: State of Punjab v. Gurmit Singh (1996, Supreme Court of India)
Facts:
A murder case where the accused was identified through fingerprints left on a weapon.
Legal Issue:
Whether fingerprint evidence alone can be used for conviction.
Judgment:
Supreme Court held:
Fingerprints are highly reliable, especially when collected scientifically and uncontaminated.
Conviction can be based on fingerprint evidence along with corroborating facts.
Importance:
Established fingerprints as strong evidence, though corroboration is preferable.
Case 2: State of Maharashtra v. Rathi (2001, Bombay High Court)
Facts:
Accused in a rape and murder case was linked via DNA testing of semen recovered at the crime scene.
Judgment:
Court held:
DNA evidence is admissible under Section 45 of the Evidence Act.
Scientific reliability is key; proper chain of custody must be maintained.
Importance:
Affirmed DNA as conclusive evidence in Indian courts when handled properly.
Case 3: Lallu Yeshwant Singh v. State of UP (1998, Allahabad High Court)
Facts:
Accused implicated in multiple murders; fingerprint analysis showed matches with crime scenes.
Judgment:
Court emphasized:
Fingerprint matches must follow scientific procedure.
Courts may rely on expert testimony and lab certification.
Importance:
Strengthened the principle that fingerprint evidence is scientifically credible and admissible.
Case 4: Selvi v. State of Karnataka (2010, Supreme Court of India)
Facts:
Case involved collection of biological samples for DNA testing.
Legal Issue:
Whether collection of DNA violates Article 20(3) (self-incrimination).
Judgment:
Supreme Court held:
Non-testimonial evidence (like DNA) does not violate Article 20(3).
Accused cannot refuse DNA sample; involuntary collection for investigation is permissible.
Importance:
Clarified constitutional validity of DNA collection in criminal investigations.
Case 5: State (NCT of Delhi) v. Navjot Sandhu (Aka Parliament Attack Case, 2005)
Facts:
Fingerprints and DNA were used to link multiple accused to explosives and crime scene.
Judgment:
Court accepted fingerprints and DNA as highly reliable evidence.
Multiple forms of forensic evidence were combined for strong corroboration.
Importance:
Demonstrated combined use of DNA and fingerprint evidence in terrorism and high-profile cases.
Case 6: Nanda v. State of Karnataka (2007, Karnataka High Court)
Facts:
Accused challenged DNA evidence in rape case, alleging improper collection and contamination.
Judgment:
Court held:
DNA evidence is admissible only if proper chain of custody is maintained.
Technical flaws can be raised in cross-examination but do not automatically make evidence inadmissible.
Importance:
Established standards for handling DNA evidence and scope for defense challenge.
Case 7: State of Tamil Nadu v. Ananthi (2012, Madras High Court)
Facts:
Accused in sexual assault case denied involvement; DNA from victim’s samples matched accused.
Judgment:
Court convicted relying heavily on DNA match, emphasizing statistical probability and lab certification.
Importance:
Reiterated DNA as conclusive scientific evidence in sexual offence cases.
5. General Principles from Case Laws
Admissibility:
DNA and fingerprints are admissible as expert evidence under Section 45 of Evidence Act.
Corroboration:
Fingerprint evidence is reliable but corroboration strengthens the case.
Chain of Custody:
Proper collection, preservation, and handling are critical for both DNA and fingerprints.
Constitutional Validity:
Collection of DNA is non-testimonial and does not violate self-incrimination rights.
Statistical Reliability:
DNA matches are probabilistic; high statistical certainty increases evidentiary value.
Combined Evidence:
DNA and fingerprints together increase conviction likelihood in serious crimes.
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