1. Introduction

DNA-based identity verification is the process of identifying an individual or determining a biological relationship by analysing their deoxyribonucleic acid (DNA). It is used in criminal investigations, paternity disputes, identification of missing persons and unidentified bodies, inheritance litigation, immigration matters, and certain civil proceedings.

The legal validity of DNA-based identity verification depends on more than scientific accuracy. Courts must also consider whether the sample was lawfully obtained, whether the testing process was reliable, whether the evidence is admissible, and whether its use violates constitutional rights to privacy, dignity, or bodily integrity.

In India, DNA evidence is generally capable of being admitted and relied upon by courts, but DNA testing does not automatically establish every legal aspect of a person's identity, nor can it be imposed in every case without legal justification.

The Supreme Court of India has developed important principles concerning DNA evidence, compulsory testing, privacy, and the evidentiary value of scientific findings.

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2. Meaning and scope of DNA-based identity verification

DNA-based identity verification involves comparing genetic profiles obtained from biological samples, such as blood, saliva, hair roots, or other suitable biological material.

Its legal applications include:

Criminal law: Comparing biological traces recovered from a crime scene with a suspect's DNA profile.

Family law: Determining biological parentage in appropriate paternity or maternity disputes.

Civil law: Resolving identity, succession, inheritance, and certain disputed relationship claims.

Missing persons: Identifying missing individuals or human remains through comparison with reference samples.

Immigration and nationality: Supporting family-relationship claims where applicable law or an authorised procedure permits genetic evidence.

Disaster victim identification: Establishing identity when visual identification or ordinary records are insufficient.

An important distinction is that DNA evidence can establish a biological connection with a high degree of scientific confidence, but it does not necessarily establish legal parenthood, citizenship, marital status, or the full legal identity of a person.

For example, a DNA test may establish biological parentage, while the legal consequences of that relationship remain governed by the applicable family, succession, citizenship, or registration laws.

3. Constitutional and statutory framework in India

A. Article 21: Life, personal liberty, and privacy

Article 21 of the Constitution protects life and personal liberty. The Supreme Court has interpreted it to protect important interests in privacy, dignity, and bodily autonomy.

DNA collection can involve two distinct privacy concerns:

Physical privacy: Obtaining a biological sample from a person.

Informational privacy: Analysing, retaining, sharing, or reusing genetic information.

A DNA test may be justified when necessary for a legitimate legal purpose, but the method used must respect applicable legal safeguards and the rights of affected persons.

B. Article 20(3): Protection against compelled self-incrimination

Article 20(3) protects an accused person against being compelled to be a witness against themselves.

The Supreme Court has distinguished the collection of physical evidence from compelled testimonial statements. DNA sampling ordinarily produces physical or scientific evidence rather than a testimonial statement, although the lawfulness of collection and subsequent use must still be assessed separately.

C. Bharatiya Sakshya Adhiniyam, 2023

The Bharatiya Sakshya Adhiniyam, 2023 (BSA) replaced the Indian Evidence Act, 1872, for proceedings governed by the new legislation from 1 July 2024, subject to its savings provisions.

Its framework for expert opinion and electronic or documentary evidence may be relevant when DNA reports are presented in court. A DNA report is not immune from scrutiny merely because it is scientific.

The court may examine the qualifications of the expert, the methodology employed, the integrity of the sample, the chain of custody, and the relationship between the scientific conclusion and the fact that must legally be proved.

Older judgments interpreting the Indian Evidence Act remain important precedents where their principles are applicable under the current law.

D. Criminal procedure and forensic evidence

The Bharatiya Nagarik Suraksha Sanhita, 2023 (BNSS), together with applicable special legislation and constitutional principles, governs relevant aspects of criminal investigation and procedure.

The precise legal authority for collecting DNA samples depends on the type of proceeding, the person being tested, the statutory power invoked, and whether consent or a judicial order is required.

4. Leading judicial precedents on DNA-based identity verification

Case 1: Goutam Kundu v. State of West Bengal (1993) 3 SCC 418

Legal principle: DNA or blood testing cannot be ordered routinely.

The Supreme Court considered the circumstances in which blood testing could be directed in a paternity dispute.

The Court established that:

A court cannot order a blood test merely because one party requests it.

The applicant must establish a strong prima facie case.

The court must consider the consequences for the child and the family.

A person cannot ordinarily be compelled to provide a blood sample without lawful justification.

Significance: A request for DNA-based identity verification must have a legitimate evidentiary purpose and satisfy the applicable legal requirements.

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Case 2: Sharda v. Dharmpal (2003) 4 SCC 493

Legal principle: Courts possess powers to order medical examinations in appropriate matrimonial proceedings.

The Supreme Court considered whether a matrimonial court could direct a party to undergo a medical examination.

It held that a matrimonial court has the power to order an appropriate medical examination where the facts justify it. Refusal to comply may, in suitable circumstances, permit the court to draw an adverse inference.

However, such an order must be justified by the circumstances and cannot be treated as an unlimited power to compel intrusive testing.

Significance: DNA testing may be legally permissible in matrimonial litigation, but judicial authority must be exercised carefully and proportionately.

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Case 3: Selvi v. State of Karnataka (2010) 7 SCC 263

Legal principle: Bodily autonomy and protection against compelled testimonial evidence.

The Supreme Court examined the constitutionality of involuntary narcoanalysis, polygraph examinations, and brain electrical activation profile tests.

The judgment distinguished physical evidence from techniques that compel testimonial responses. It also discussed DNA profiling and its potential use in identification.

The Court's reasoning supports an important distinction: obtaining physical evidence is not automatically equivalent to compelling a person to testify against themselves. Nevertheless, this does not mean that every method of collecting, retaining, or analysing DNA is constitutionally valid.

Significance: DNA evidence may be used for identification purposes, subject to lawful collection, applicable procedural safeguards, and constitutional limitations.

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Case 4: Bhabani Prasad Jena v. Convenor Secretary, Orissa State Commission for Women (2010) 8 SCC 633

Legal principle: The test of eminent need.

The Supreme Court held that DNA testing in paternity disputes should not be ordered as a matter of routine.

The court must consider whether the test is genuinely necessary to decide the dispute, whether the matter can be resolved using other evidence, and whether the test would disproportionately affect privacy, bodily integrity, or the child's interests.

The Court also held that the Orissa State Commission for Women lacked the statutory authority to determine paternity by ordering such a test in the circumstances before it.

Significance: An institution cannot order DNA testing merely because it considers the test scientifically useful. It must possess the necessary legal authority, and the order must satisfy the applicable standards of necessity.

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Case 5: Nandlal Wasudeo Badwaik v. Lata Nandlal Badwaik (2014) 2 SCC 576

Legal principle: Scientific DNA evidence may prevail over a statutory presumption in an appropriate case.

The Supreme Court considered a maintenance dispute in which DNA test results excluded the husband as the biological father of the child.

The Court accepted the genuine DNA results and held that, on the facts before it, the scientific evidence could prevail over the presumption under Section 112 of the Indian Evidence Act, 1872.

The decision demonstrates that a legal presumption is not necessarily conclusive in every practical situation where the law permits it to be rebutted.

However, this judgment should not be interpreted as granting an unrestricted right to obtain DNA tests or as abolishing legal presumptions protecting children born during marriage.

Significance: Reliable DNA evidence can be decisive when biological parentage is genuinely in issue and the test has been lawfully obtained.

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Case 6: Dipanwita Roy v. Ronobroto Roy (2015) 1 SCC 365

Legal principle: Balancing evidentiary necessity against privacy.

The Supreme Court considered a matrimonial dispute involving allegations of adultery and a request for DNA testing.

The Court accepted that DNA testing could be permitted where it was eminently necessary to resolve the issue, after balancing the interests of the parties. It also recognised that an adverse inference might be drawn in appropriate circumstances if a party refused to comply with a lawful testing direction.

Significance: DNA testing may assist in proving a disputed biological relationship, but the court must determine whether the evidence is genuinely necessary and whether less intrusive alternatives are adequate.

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Case 7: Justice K.S. Puttaswamy (Retd.) v. Union of India (2017) 10 SCC 1

Legal principle: Privacy is a constitutionally protected right.

A nine-judge bench of the Supreme Court recognised privacy as a fundamental right under the Constitution, grounded principally in Article 21 and the broader guarantees of Part III.

The judgment is highly relevant to DNA databases and genetic identification because DNA contains deeply personal information. The legal implications extend beyond the physical act of collecting a sample to the storage, sharing, retention, and secondary use of genetic profiles.

Government action that interferes with fundamental rights must satisfy the applicable constitutional requirements, including legality and proportionality.

Significance: A DNA-based identity system cannot be justified solely by administrative convenience. Its legal basis, purpose, safeguards, and impact on individual privacy must be considered.

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Case 8: Supreme Court decision dated 10 November 2025, Criminal Appeal No. 1013 of 2021

The Supreme Court's judgment available through its official website provides a recent illustration of the limits on compelled DNA testing.

The Court refused to direct DNA testing in the circumstances of that case, emphasising the privacy and dignity of the individuals concerned, the interests of the child, and the availability of other evidence to resolve the relevant allegations. It applied the principles of eminent need and constitutional proportionality.

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Significance: Even where a party claims that DNA testing would establish biological truth, the court must examine whether the test is necessary to decide the actual legal dispute. A test that is scientifically informative may still be legally unjustified.

5. Legal admissibility of DNA evidence under current Indian law

The Bharatiya Sakshya Adhiniyam, 2023, provides the current general framework for evidence in proceedings governed by that Act.

Section 39 deals with expert opinions, including opinions on scientific questions. DNA evidence may be presented through an appropriately qualified expert, subject to the applicable evidentiary rules.

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A court assessing DNA evidence will ordinarily consider the following factors:

The court retains responsibility for deciding what the evidence proves. A DNA report is expert evidence, not an automatic judicial determination of guilt, parentage, or legal identity.

6. DNA identity verification and privacy rights

DNA information is particularly sensitive because it can reveal biological relationships and may carry information about inherited characteristics.

The legal issues become more serious when DNA is collected on a compulsory basis or retained in a database for future identification.

Three distinct questions must be considered:

Collection: Was the sample obtained with valid consent or under lawful authority?

Processing: Was the genetic analysis restricted to a legitimate and authorised purpose?

Retention and disclosure: Is there a lawful basis for storing the profile, sharing it with third parties, or using it in another investigation?

A person who voluntarily submits a DNA sample for one purpose does not necessarily consent to every future use of the resulting profile.

Similarly, consent given by one family member does not automatically eliminate the independent privacy interests of another person, including a child.

7. DNA-based identity verification in criminal proceedings

DNA evidence can link a biological sample found at a crime scene to a suspect or help exclude an individual from consideration.

However, a DNA match does not invariably establish that the person committed the offence. The prosecution may still need to establish how the biological material came to be at the location, when it was deposited, and whether contamination or innocent transfer is a plausible explanation.

The strength of the evidence depends on the quality of the sample, the statistical interpretation of the match, the surrounding facts, and the other evidence in the case.

For example, a DNA profile found on an object may establish a biological association with that object, but it may not by itself establish when the person touched it or whether the contact was criminal.

Courts must therefore assess DNA evidence together with the full evidentiary record and the applicable standard of proof.

8. DNA-based identity verification in paternity and inheritance disputes

In family and succession disputes, DNA evidence can be highly relevant to biological relationships. Nevertheless, biological parentage and legal parentage are not always identical.

The court may have to consider:

Statutory presumptions concerning legitimacy.

The legal status and welfare of a child.

The rights of a presumed parent and the biological parent.

The necessity and proportionality of testing.

Whether documentary, testimonial, or other evidence can resolve the dispute.

The legal consequences of establishing biological parentage.

In inheritance litigation, proving a biological relationship may be relevant but does not necessarily establish entitlement to inherit. Applicable succession laws, adoption rules, testamentary documents, and other legal requirements remain relevant.

9. Practical safeguards for legally reliable DNA verification

A legally defensible DNA verification process should ordinarily incorporate the following safeguards:

1. Establish legal authority

Identify the legitimate purpose of the test and obtain valid consent or the necessary legal authorisation.

2. Use competent forensic facilities

Ensure appropriate expertise, validated testing procedures, contamination controls, and quality assurance.

3. Preserve the chain of custody

Document sample collection, sealing, transportation, laboratory receipt, and testing.

4. Produce a reasoned expert report

Explain the method, results, limitations, and statistical significance without overstating certainty.

5. Protect genetic information

Restrict access, prevent unauthorised disclosure, and apply appropriate retention and deletion rules.

These safeguards strengthen the reliability of the evidence and reduce the risk of constitutional challenges, evidentiary objections, and wrongful identification.

10. Critical legal issues and emerging challenges

DNA-based identity verification raises several important questions for future legislation and judicial interpretation.

First, genetic privacy: DNA databases may enable identification beyond the original purpose for which a sample was collected.

Second, consent and coercion: A person may face pressure to provide a sample even when the legal basis for compulsory testing is unclear.

Third, errors and contamination: Sample substitution, contamination, laboratory error, or incorrect statistical interpretation can undermine otherwise persuasive scientific evidence.

Fourth, familial searching: A database match may reveal information about relatives who have not themselves provided samples.

Fifth, automated identity systems: Combining genetic profiles with biometric databases, digital identity records, or law-enforcement systems increases the importance of access controls, audit trails, and independent oversight.

Sixth, children and vulnerable persons: Genetic testing can affect family relationships, personal dignity, and a child's interests long after the proceedings have ended.

These concerns support a legal framework that combines scientific reliability with necessity, proportionality, accountability, and protection of personal information.

11. Conclusion

DNA-based identity verification is legally recognised and can be powerful evidence in India, particularly in criminal investigations, disputed parentage, identification of human remains, and civil litigation.

Its validity, however, is conditional rather than absolute. The legal outcome depends on the relevance and reliability of the evidence, the lawfulness of sample collection, applicable procedural rules, and the constitutional rights of the individuals concerned.

The principal judicial lessons are:

Goutam Kundu and Bhabani Prasad Jena restrict routine or unnecessary compulsory testing.

Sharda recognises judicial authority to order appropriate medical examinations in justified circumstances.

Selvi distinguishes physical evidence from compelled testimonial evidence.

Nandlal Wasudeo Badwaik illustrates the potentially decisive role of reliable DNA evidence in a paternity dispute.

Puttaswamy establishes the constitutional importance of privacy.

The Supreme Court's 2025 decision illustrates that privacy, dignity, and the availability of alternative evidence can outweigh a request for DNA testing.

The governing principle is that scientific accuracy and legal validity are related but distinct. A DNA result must be obtained lawfully, proved reliably, and used for a legitimate legal purpose before it can properly support a judicial determination.

This explanation concerns Indian law and is intended for legal research and education. The applicable law may differ depending on the proceedings, the date of the case, and the statutory authority under which a sample is collected.