Accused’s Specimen Signatures in Police Custody

Editorial correction — 14 October 2026. The former note presented a CrPC-era controversy as current law and omitted the Criminal Procedure (Identification) Act, 2022. The Bharatiya Nagarik Suraksha Sanhita, 2023 (BNSS) has replaced the CrPC for new matters from 1 July 2024, subject to its savings provision. Current analysis must distinguish the 2022 Act measurement power from a Magistrate’s order under BNSS section 349.

Jurisdiction and scope: India; obtaining specimen signatures or handwriting during a criminal investigation. Fingerprints, voice samples and biological samples are mentioned only to distinguish the statutory routes. Law checked: 14 October 2026.

Short answer

Do not advise that police may simply demand a specimen in every case, or that only a Magistrate can ever authorize collection. First determine which enactment supplies the power. The Criminal Procedure (Identification) Act, 2022 defines “measurements” to include signatures and handwriting and authorizes collection from the persons specified in section 3 by the officers it identifies. Section 5 separately empowers a Magistrate to direct any person to give measurements when the statutory expediency test is met. BNSS section 349 empowers a first-class Magistrate to order any person, including an accused, to give specimen signatures, finger impressions, handwriting or voice sample for an investigation or proceeding, subject to its arrest provisos. Article 20(3) does not ordinarily convert a compelled physical specimen into testimonial self-incrimination, but it still protects compelled communication of personal knowledge.

Procedure

1. Fix the procedural code. Record when the investigation, inquiry, trial or other proceeding began. BNSS commenced on 1 July 2024. Section 531 preserves the former CrPC for matters pending immediately before commencement in the circumstances stated there. Do not cite BNSS section 349 to a saved CrPC matter without analyzing section 531.
2. Identify the proposed material precisely. State whether investigators seek a signature, handwriting, finger impression, voice sample, photograph, iris or retina scan, or a physical or biological sample. The legal gateway and safeguards are not interchangeable.
3. Test the 2022 Act route. Section 2(1)(b) includes signatures and handwriting within “measurements.” Section 3 lists the convicted, arrested and other persons who may be required to allow measurements and identifies the police or prison officer who may take them. Apply the text to the person’s actual status; do not infer eligibility from mere suspicion.
4. Test a Magistrate’s section 5 order. Under the 2022 Act, a Magistrate may direct any person to give measurements if satisfied that it is expedient for an investigation or proceeding under the criminal-procedure code or another law. The order, purpose, person, measurement and collection record should be preserved.
5. Test BNSS section 349 separately. A Magistrate of the first class must be satisfied that the direction is expedient for an investigation or proceeding under the BNSS. The section covers an accused and specifies signatures, finger impressions, handwriting and voice sample. Ordinarily the person must at some time have been arrested in connection with the matter; the second proviso permits an order without arrest for reasons recorded in writing.
6. Check the 2022 Rules. The Criminal Procedure (Identification) Rules, 2022 govern taking, handling and database treatment under the 2022 Act. Identify the authorized user or person taking the measurement, the registered device or physical collection route, conversion to the standard digital format, upload and acknowledgments. A BNSS order does not eliminate applicable handling rules under the separate Act where that regime is used.
7. Keep the constitutional issue distinct. The Supreme Court has repeatedly applied State of Bombay v Kathi Kalu Oghad to distinguish specimen handwriting, signatures, fingerprints and comparable physical characteristics from compelled testimonial communication. That does not authorize coercive interrogation or compelled disclosure of personal knowledge. Record exactly what the person was required to do.
8. Preserve comparison integrity. Record the order or statutory authority, date, place, collector, number of specimens, writing dictated or copied, witnesses, seal or digital identifier, dispatch to the examiner, laboratory receipt and the questioned document used for comparison. Challenge or prove the chain independently of the constitutional issue.
9. Address retention and destruction. Section 4 of the 2022 Act assigns the National Crime Records Bureau record functions and states the retention period, with a destruction proviso for specified persons released without trial, discharged or acquitted after legal remedies, unless the court or Magistrate records reasons otherwise. Obtain and preserve the final-case status needed for any destruction request.
10. Analyze refusal under the correct provision. Section 6 of the 2022 Act addresses resistance or refusal under that Act. Do not threaten a consequence from a different statute or assume that every informal request activates section 6.

File checklist

• Commencement date and BNSS section 531 transition analysis
• Exact specimen or measurement sought
• Person’s conviction, arrest or proceeding status
• Invoked provision: 2022 Act section 3 or 5, BNSS section 349, or saved CrPC
• Magistrate’s satisfaction, arrest history and recorded reasons where required
• Collector’s authority and 2022 Rules compliance
• Specimen sheet or digital record, seal, dispatch and expert receipt
• Questioned document and comparison methodology
• Final disposition and record-destruction eligibility

Common errors

• Using former CrPC section 311A as the only current source.
• Conflating police collection under the 2022 Act with a BNSS section 349 order.
• Ignoring the BNSS savings clause for pre-commencement matters.
• Calling every specimen “testimonial” without separating physical comparison from communicated knowledge.
• Ignoring retention and destruction consequences after acquittal or discharge.

Official sources

Automated-research disclosure: This correction was produced by automated comparison of the current statutes, Gazette rules and official Supreme Court material. The applicable state collection protocol and the specific order must be checked in the file. Next review: 14 January 2027.