1. Meaning of Specimen Retention

Specimen retention means the continued preservation or storage of a physical or biological sample after it has been collected for investigation, forensic examination or trial.

Examples include:

• blood samples;
• saliva/buccal swabs;
• semen;
• vaginal/anal swabs;
• hair;
• tissue;
• bodily fluids;
• fingerprints;
• photographs;
• iris/retinal scans; and
• DNA profiles/data derived from biological material.

The legal problem is not simply whether a specimen can be collected, but also:

For how long can it be retained, for what purpose, who can access it, how securely must it be stored, and when must it be destroyed?

2. Why Specimen Retention Creates Legal Challenges

Retention produces a conflict between two competing interests:

State interest

The State wants to retain forensic material because it may be useful for:

• solving future offences;
• re-testing evidence;
• appeals;
• identification of offenders;
• matching with crime-scene evidence;
• preventing repeat offences.

Individual interest

The individual has interests in:

• privacy;
• bodily autonomy;
• dignity;
• personal liberty;
• protection from surveillance;
• protection against misuse of genetic information; and
• destruction of information when there is no legitimate reason to retain it.

Therefore:

The longer the State retains a biological specimen or DNA profile, the stronger the justification and safeguards required.

3. Present Statutory Position — Criminal Procedure (Identification) Act, 2022

A very important development is the Criminal Procedure (Identification) Act, 2022 (CPI Act).

The Act expressly defines "measurements" broadly to include fingerprints, palm prints, footprints, photographs, iris and retina scans, physical and biological samples and their analysis, as well as certain behavioural attributes and examinations.

Criminal Procedure (Identification) Act, 2022 — India Code

4. Retention Period of 75 Years

Section 4(2) of the 2022 Act provides that records of measurements are to be retained in digital or electronic form for 75 years from the date of collection.

This is one of the most significant legal issues.

Why 75 years is controversial

A person's biological information can potentially remain identifiable for practically the individual's entire lifetime.

Therefore, the question arises:

Is retaining such information for 75 years always necessary and proportionate?

This question becomes particularly significant where the individual is:

• never convicted;
• discharged;
• acquitted;
• released without trial; or
• merely arrested but never prosecuted successfully.

5. Protection for Persons Acquitted or Released

The Act contains an important safeguard.

Where a person:

1. has not previously been convicted of an offence punishable with imprisonment for any term;
2. has had measurements taken;
3. is released without trial, discharged or acquitted; and
4. has exhausted all legal remedies,

the records are to be destroyed unless the court or Magistrate directs otherwise for reasons recorded in writing.

This creates a balance between:

Retention → public safety

and

Destruction → privacy and rehabilitation of the innocent.

6. Major Legal Challenge: Privacy

The most important constitutional case is:

Justice K.S. Puttaswamy (Retd.) v. Union of India

(2017) 10 SCC 1

A nine-judge Constitution Bench recognized privacy as a fundamental right under the Constitution.

Privacy includes aspects of:

• bodily integrity;
• personal autonomy;
• dignity;
• informational privacy; and
• control over personal information.

Application to specimen retention

DNA is more sensitive than an ordinary photograph because genetic material may potentially reveal information concerning an individual beyond simple identity.

Therefore, retention of DNA-related material raises questions such as:

• Why is it being retained?
• What is the statutory purpose?
• Who can access it?
• Can it be shared with another agency?
• Can it be used for a different investigation?
• How long should it remain stored?
• What happens after acquittal?

7. Principle of Proportionality

After Puttaswamy, restrictions on privacy cannot be justified merely by saying:

"It helps criminal investigation."

The State must have a legally defensible justification.

A useful constitutional framework is:

1. Legality

There must be a valid legal basis.

2. Legitimate State Aim

The retention should pursue a legitimate purpose such as investigation or identification.

3. Rational Connection

Retention must actually assist that purpose.

4. Necessity

There should not be a substantially less intrusive alternative.

5. Balancing

The benefit to society must be balanced against the individual's privacy and liberty.

Thus, indefinite retention without safeguards can face a serious Article 21 challenge.

8. Selvi v. State of Karnataka

Selvi v. State of Karnataka, (2010) 7 SCC 263

This case dealt principally with involuntary narcoanalysis, polygraph examination and Brain Electrical Activation Profile (BEAP) tests.

The Supreme Court distinguished between:

• testimonial evidence, and
• physical evidence.

The Court observed that DNA samples are physical evidence and that taking/retaining DNA samples does not, by itself, create the same Article 20(3) problem as compelled testimonial statements.

This is an important distinction.

Principle

Taking a physical biological specimen is not automatically equivalent to compelling an accused to testify against himself.

However, this does not mean that retention and subsequent use are completely free from constitutional restrictions.

Privacy under Article 21 remains relevant.

9. Difference Between DNA Sample and DNA Profile

This distinction is extremely important for an examination.

DNA Sample

The actual biological material:

• blood;
• saliva;
• hair;
• tissue;
• semen;
• buccal swab.

DNA Profile

The digital/scientific information generated from analysing the sample for identification.

A DNA sample may contain substantially more biological information than what is necessary for identification.

The Supreme Court in Selvi expressly distinguished between a DNA sample and a DNA profile.

Legal significance

Retention of:

physical sample

and retention of:

digital DNA profile

are not necessarily the same privacy issue.

The law should therefore distinguish between them.

10. Retention and Article 20(3)

Article 20(3) provides protection against compelled self-incrimination.

The question is:

Does compelling an accused to provide blood/DNA amount to forcing him to be a witness against himself?

The jurisprudence distinguishes physical evidence from testimonial communication.

Thus, collection of physical samples such as fingerprints or DNA has generally been treated differently from compelled testimonial statements.

The 2022 CPI Act consequently provides a statutory mechanism for taking "measurements", including biological samples.

11. Criminal Procedure (Identification) Act — Scope of Collection

Section 3 permits measurement-taking from persons including:

• convicted persons;
• certain persons ordered to give security for good behaviour; and
• persons arrested for offences or detained under preventive-detention laws.

There is, however, a proviso concerning biological samples: certain persons arrested for less serious offences are not obliged to provide biological samples, subject to the exceptions specified by the Act.

This creates an important distinction between:

taking a specimen
and
retaining the resulting record for decades.

12. Who Controls the Records?

The Act assigns important responsibilities to the National Crime Records Bureau (NCRB).

NCRB is empowered to:

• collect records;
• store and preserve them;
• destroy them;
• process them with crime/criminal records; and
• share/disseminate them with law-enforcement agencies in the prescribed manner. 

Legal concern

This creates the possibility of a very large national forensic/identification database.

Therefore, questions arise regarding:

• access control;
• unauthorized disclosure;
• cybersecurity;
• inter-agency sharing;
• purpose limitation;
• retention;
• deletion;
• audit trails.

13. Chain of Custody — The Most Important Evidentiary Challenge

Retention has another dimension: evidentiary reliability.

A specimen may be perfectly collected but become legally unreliable if:

• it is improperly sealed;
• storage conditions are inadequate;
• it is not properly labelled;
• it remains with the police for an unexplained period;
• the package is opened without authorization;
• it is transferred without documentation;
• contamination occurs; or
• the chain of custody cannot be established.

Therefore:

Retention is useful only if the integrity of the specimen is preserved.

14. Kattavellai @ Devakar v. State of Tamil Nadu — 2025

This is currently one of the most important Supreme Court authorities on DNA specimen handling and retention.

Kattavellai @ Devakar v. State of Tamil Nadu

2025 INSC 845, decided 15 July 2025

The Supreme Court found serious defects in the handling of DNA evidence.

The Court noted:

• unexplained delays;
• gaps in chain of custody;
• possibility of contamination;
• inadequate care of sensitive DNA evidence; and
• lack of a uniform procedure.

The Court ultimately held that the DNA evidence had been rendered unusable.

15. Supreme Court's New Directions on DNA Evidence

The significance of Kattavellai is that the Supreme Court issued specific directions for all cases involving DNA evidence.

Direction 1 — Proper Packaging and Documentation

DNA samples must be properly collected and packaged.

The documentation should include:

• FIR number and date;
• relevant statutory provisions;
• investigating officer;
• police station;
• serial number.

The collection record should carry the signatures/designations of relevant officials and medical personnel; efforts regarding independent witnesses should also be recorded.

16. Direction 2 — 48-Hour Transmission

The investigating officer is responsible for ensuring that the DNA samples reach the concerned forensic laboratory within 48 hours of collection.

If this is not possible because of an extraneous circumstance, the reason for delay must be recorded in the case diary.

The sample must also be preserved according to the requirements applicable to its nature.

Importance

This directly addresses one of the principal problems in specimen retention:

Long and unexplained storage before forensic examination can undermine evidentiary value.

17. Direction 3 — No Unauthorized Opening or Resealing

While DNA samples are stored during:

• trial;
• appeal; or
• other proceedings,

the package should not be opened, altered or resealed without express authorization from the Trial Court.

The Court must be satisfied, based on qualified medical opinion, that opening the package will not adversely affect the integrity of the evidence and is necessary for the proper outcome of the case.

This is extremely important for specimen retention.

18. Direction 4 — Chain of Custody Register

The Court directed that a Chain of Custody Register be maintained from collection until the logical conclusion of the case—conviction or acquittal.

Every movement of the evidence must be recorded, with:

• countersignature;
• date/movement;
• reason for movement.

The register must form part of the Trial Court record.

Failure to maintain it requires the investigating officer to explain the lapse.

19. Why Kattavellai is a Landmark Case

The judgment establishes that DNA evidence is not automatically reliable merely because it is scientifically sophisticated.

The Court stated that sensitive evidence such as DNA requires a high degree of uniformity and careful preservation. It specifically criticized the lack of a common procedure and held that differences in police procedures cannot justify inadequate safeguards for DNA evidence.

Key principle

Scientific evidence is only as reliable as the process through which it is collected, preserved, transported and produced before the court.

20. Prakash Nishad v. State of Maharashtra

Prakash Nishad @ Kewat Zinak Nishad v. State of Maharashtra, 2023 SCC OnLine SC 666

The case illustrates the importance of compliance with the statutory procedure for obtaining biological samples.

The Supreme Court examined deficiencies concerning the collection and medical examination of the accused and the use of DNA evidence.

Relevance

A DNA match does not automatically cure defects in:

• collection;
• authorization;
• medical examination;
• sealing;
• storage;
• chain of custody.

Thus:

Scientific accuracy and procedural legality must operate together.

21. Rahul v. State (NCT of Delhi)

The Supreme Court has also emphasized the significance of proper handling of biological evidence in Rahul v. State (NCT of Delhi), (2023) 1 SCC 83.

The case is frequently relied upon in the context of deficiencies in handling forensic/biological evidence.

This line of authority demonstrates that courts will scrutinize whether the prosecution has established an unbroken chain connecting:

collection → sealing → storage → transmission → forensic examination → production in court.

The 2025 Kattavellai judgment itself referred to Rahul and other cases dealing with improper handling of biological samples.

22. Bhabani Prasad Jena v. Convenor, Orissa State Commission for Women

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

The Supreme Court considered whether DNA testing should be ordered in a paternity dispute.

The Court emphasized that DNA testing should not be ordered routinely and that courts must consider the competing interests involved.

Relevance to specimen retention

The case shows that:

Collection of biological material is not merely a technical act; it affects personal and family rights.

Therefore, necessity must be considered before intrusive biological testing is ordered.

23. Dipanwita Roy v. Ronobroto Roy

Dipanwita Roy v. Ronobroto Roy, (2015) 1 SCC 365

The Supreme Court recognized the evidentiary importance of DNA testing in appropriate circumstances.

However, the Court also indicated that DNA testing should not be ordered indiscriminately and must be considered in light of the circumstances of the case.

This establishes the balance:

Truth-finding ↔ privacy, dignity and other legal interests.

24. Aparna Ajinkya Firodia v. Ajinkya Arun Firodia

Aparna Ajinkya Firodia v. Ajinkya Arun Firodia (2023)

The Supreme Court refused to treat DNA testing as an automatic method of resolving a paternity-related dispute.

The Court emphasized the statutory protection surrounding legitimacy and the need for compelling circumstances before directing DNA testing.

Principle for specimen retention

If even collection/testing requires judicial caution, then long-term retention of biological information logically raises an additional privacy question.

25. Privacy of Children

Specimen retention becomes particularly sensitive where the specimen belongs to:

• a child;
• a victim of sexual assault;
• a vulnerable person; or
• a person ultimately found innocent.

A child's DNA should not become a permanent investigative resource without adequate legal justification.

The jurisprudence in Aparna Firodia demonstrates the importance courts attach to the child's dignity and legal interests when DNA testing is proposed.

26. Major Legal Challenges in Specimen Retention

A. Excessive Retention

A 75-year statutory retention period raises the question of whether a uniform period is proportionate for every category of person and every type of record.

B. Retention After Acquittal

Even where destruction is contemplated, it occurs under the statutory conditions and after exhaustion of legal remedies.

This can mean that records remain in existence for a considerable period.

The legal concern is:

Should an acquitted person continue to have his biological information stored in a criminal database?

The CPI Act attempts to address this by providing for destruction in specified circumstances, but the issue remains constitutionally significant.

C. Secondary Use

A specimen collected for one criminal investigation could potentially become useful in another investigation.

This creates a purpose limitation problem.

For example:

DNA collected in Case A → retained → later compared with evidence from Case B.

The question is whether the original statutory authorization permits such subsequent use and whether adequate safeguards exist.

D. Unauthorized Access

DNA databases create risks of:

• unauthorized access;
• leaks;
• misuse;
• profiling;
• identity theft;
• discriminatory use.

Because DNA is uniquely associated with an individual, unauthorized disclosure can seriously affect privacy.

E. Genetic Information Beyond Identification

A biological specimen potentially contains information beyond the immediate forensic purpose.

This raises a fundamental question:

Should the State retain the entire biological specimen when it only requires a limited DNA profile for identification?

This is one reason why sample retention and profile retention should be treated as distinct legal questions.

27. Specimen Retention and Data Protection

The Digital Personal Data Protection Act, 2023 provides a broader statutory framework for digital personal data.

However, forensic DNA regulation raises specialized questions concerning:

• law-enforcement processing;
• statutory exemptions;
• sensitive information;
• access;
• security;
• retention;
• deletion.

Consequently, a DNA database requires both:

criminal-procedure safeguards + constitutional privacy safeguards + applicable data-protection safeguards.

28. Evidentiary Challenge: Contamination

A retained specimen may become contaminated because of:

• improper temperature;
• moisture;
• incorrect packaging;
• improper handling;
• cross-contamination;
• repeated opening;
• inadequate storage conditions.

If contamination occurs, the defence can challenge:

• reliability;
• authenticity;
• integrity;
• chain of custody;
• evidentiary weight.

The Supreme Court's Kattavellai decision demonstrates how serious these problems can become. The Court found that unexplained delay, an unestablished chain of custody and possible contamination rendered the DNA evidence unusable.

29. Specimen Retention and Fair Trial

Article 21 includes the guarantee of a fair criminal process.

Suppose the prosecution retains a biological specimen for years but cannot explain:

• where it was stored;
• who handled it;
• whether it was opened;
• how it was transported;
• whether it was contaminated.

The accused can legitimately challenge the evidentiary reliability of the material.

Therefore:

Poor specimen management can become a fair-trial issue, not merely an administrative defect.

30. Burden on the Prosecution

Where DNA evidence is relied upon, the prosecution must establish the evidentiary link.

A DNA report should not be viewed in isolation.

The prosecution should be able to demonstrate:

Sample identified → properly collected → properly sealed → securely stored → properly transported → received by laboratory → examined → report prepared → sample/report linked to the accused/case.

Failure in this chain can reduce or destroy the evidentiary value of the DNA material.

31. Specimen Retention vs. Chain of Custody

These concepts should be clearly distinguished.

A good legal system must regulate all seven stages.

32. Constitutional Framework

Specimen retention can potentially engage:

Article 14

Protection against arbitrary State action.

Article 19

Relevant where data practices affect protected freedoms.

Article 20(3)

Protection against compelled self-incrimination, although physical evidence such as DNA is treated differently from testimonial evidence.

Article 21

Most important provision for:

• privacy;
• dignity;
• bodily autonomy;
• personal liberty;
• fair procedure.

Article 32/226

Constitutional remedies against unlawful State action.

33. Important Case Laws — Quick Revision

34. Critical Legal Issues for an Answer

If the question in an examination is "Discuss the legal challenges relating to specimen retention", the answer should focus on these seven issues:

1. Privacy

Long-term retention of biological/genetic information may interfere with informational privacy.

2. Bodily autonomy

Collection of biological material implicates personal autonomy and dignity.

3. Proportionality

Retention must have a legitimate purpose and should not be unnecessarily excessive.

4. Innocence/acquittal

Retention after acquittal raises concerns about treating innocent persons as permanent criminal suspects.

5. Chain of custody

Improper storage or unexplained movement can destroy evidentiary reliability.

6. Data security

Large forensic databases create risks of unauthorized access and misuse.

7. Purpose limitation

Material collected for one investigation should not automatically become available for unrelated purposes without lawful authority.

35. Ideal Legal Framework for Specimen Retention

A constitutionally sound specimen-retention system should provide:

Clear statutory authority
↓
Defined purpose
↓
Limited retention period
↓
Secure storage
↓
Strict access controls
↓
Complete chain-of-custody record
↓
Independent oversight
↓
Right to challenge retention
↓
Automatic/mandatory destruction when legally required
↓
Audit and accountability

36. Conclusion

Specimen retention is necessary for modern criminal investigation, particularly DNA-based forensic investigation, but indefinite or poorly regulated retention can conflict with privacy, dignity, bodily autonomy and fair-trial principles.

Indian law now contains an important statutory framework through the Criminal Procedure (Identification) Act, 2022, including a 75-year retention rule and provisions for destruction in specified acquittal/discharge situations.

At the same time, K.S. Puttaswamy establishes privacy as a fundamental right, while Selvi distinguishes physical evidence from testimonial compulsion.

Most importantly, the Supreme Court's Kattavellai @ Devakar v. State of Tamil Nadu (2025) has imposed detailed requirements concerning collection, packaging, 48-hour transmission, secure storage, opening/resealing and a continuous chain-of-custody register.

Exam-ready conclusion

The law of specimen retention must strike a balance between the State's legitimate interest in effective crime investigation and the individual's constitutional rights to privacy, dignity, bodily autonomy and fair trial. Retention is legally sustainable only when supported by law, connected to a legitimate purpose, proportionate to that purpose, securely maintained and accompanied by effective mechanisms for review and destruction.

Most important cases to remember:
Selvi → Puttaswamy → Bhabani Prasad Jena → Dipanwita Roy → Aparna Firodia → Prakash Nishad → Rahul → Kattavellai @ Devakar.