A criminal court can compel the accused to give handwriting or voice samples, since the Supreme Court has clarified that such samples, unlike testimonial compulsion, do not violate the right against self-incrimination under Article 20(3), as they are physical evidence used for comparison rather than compelled statements of guilt. Whether a criminal court can compel the accused to give handwriting or voice samples depends on the request being made through proper procedure, typically via a court order rather than direct police compulsion, ensuring judicial oversight of the process. This distinction between testimonial and physical evidence is central to understanding why samples like these are treated differently from a compelled confession or statement.

The reasoning courts have applied draws a clear line — self-incrimination protection is meant to prevent a person from being forced to communicate knowledge or admissions against themselves, but providing a physical sample such as handwriting, voice, fingerprints, or bodily substances for scientific comparison does not involve any such communication of guilt, since the sample itself carries no inherent statement one way or another until compared against other evidence by experts. This is why courts have consistently upheld the constitutionality of compelling such samples when done through proper legal process.

If you have been asked to provide such samples, understanding the proper procedure and your rights within it is important, including confirming that the request is backed by a valid court order, that the collection process itself is conducted with dignity and proper safeguards, and that you have had the opportunity to have your lawyer informed of the process. Refusal without valid legal grounds can itself sometimes be viewed unfavourably by the court, so understanding when and how to comply, or when a genuine objection is warranted, matters considerably.

For guidance on your specific situation, Aapka Legal Advice can advise you accurately on whether the request made in your case follows proper procedure and what your rights are throughout the process. Our network of Top Criminal Lawyers in India and retired judges panel understand precisely how these sample-collection procedures should be conducted lawfully, and can help ensure your rights are protected at every step. In conclusion, while such samples can generally be compelled through proper court process, understanding exactly how that process should unfold protects you from any procedural overreach along the way.