Bharatiya Sakshya Adhiniyam 2023: Forensic Evidence in Court

BSA keeps the structure of IEA almost verbatim: relevancy, admissions, confessions, documents, oral evidence, expert evidence, presumptions, witness examination, burden of proof. The two changes that matter for a forensic-science student are the expanded treatment of electronic records under Section 63 and the explicit recognition of electronic forms of evidence across the statute.

The substantive moves are concentrated in Sections 39 and 63. The expansion of Section 39 to expressly cover electronic-evidence experts plugs a long-standing gap. Under IEA Section 45 there was a debate about whether a digital-forensics analyst counted as an "expert"; the new text removes the doubt by listing electronic evidence alongside science, art, handwriting and footprints. Section 63 codifies what the post-Anvar / Arjun Khotkar judgments had already required and gives the certificate a clearer statutory address.

Sections 3 to 50 BSA cover the relevancy framework. Sections 6 to 15 carry the res gestae, motive, conduct and similar fact doctrines forward from IEA in renumbered form. The forensic relevance is that the trial court will only look at the expert report if the underlying facts are relevant. A correctly typed DNA profile from an irrelevant exhibit is not evidence.

Sections 16 to 28 BSA deal with admissions and confessions. The forensic-side rules that recur most often in casework:

• Section 22 BSA treats a confession caused by inducement, threat or promise from a person in authority as irrelevant in a criminal proceeding.
• Section 23 BSA makes a confession to a police officer inadmissible against the accused. This is the renumbered IEA Section 25.
• Section 24 BSA makes a confession in police custody inadmissible unless made in the immediate presence of a magistrate. Renumbered IEA Section 26.
• Section 27 BSA carves out the discovery exception: so much of a confession as relates distinctly to a fact discovered in consequence of the statement is admissible. This is the renumbered IEA Section 27 and is the section most often used in narcotics and weapon-recovery cases.

The discovery exception under Section 27 BSA is the one that intersects most directly with forensic practice. When the accused, in custody, leads the police to the place where a weapon is concealed, the "so much of the statement" that led to the discovery is admissible. The forensic chain begins at the recovery point, and the seizure memo at the recovery point becomes the first document in the chain of custody (covered separately in Chain of Custody).

The other doctrinal beat candidates need to be ready for is the Selvi v State of Karnataka principle. The Supreme Court held that narco-analysis, polygraph and BEAP tests, when conducted without the subject's consent, violate Article 20(3) and Article 21, and the results are inadmissible. Voluntary results are at most "evidence to corroborate" and cannot be the sole basis of conviction. Selvi pre-dates BSA, but the principle survives the renumbering and continues to govern. The procedural rules that govern how police actually conduct the search and seizure that produces this evidence live in BNSS 2023: Investigation, FIR, Search and Seizure, and the underlying offences are defined in Bharatiya Nyaya Sanhita for Forensic Students.

Section 39 BSA reads expert opinion as the opinion of a person specially skilled in foreign law, science, art, handwriting, finger impressions, footprints or electronic evidence. The list is illustrative rather than exhaustive, but the listed heads are the ones the court most readily treats as expert domains.

1. Foundation: qualifications proved
   The expert states their qualifications, training and experience on oath. The trial court rules on whether the witness qualifies as an expert under Section 39 BSA.
2. Methods and instruments stated
   The expert describes the methods used, the instruments, and their calibration status. Worksheets are produced for inspection.
3. Opinion deposed
   The expert deposes the opinion. The opinion is not binding on the court; it is one piece of evidence to be weighed (Murari Lal v State of MP).
4. Cross-examination
   Defence cross-examines on qualifications, methods, chain of custody, and consistency with the worksheet. The cross-examination is where weak expert reports collapse.
5. Corroboration assessed
   The court asks whether the expert opinion is corroborated by other evidence. Indian appellate practice is to treat uncorroborated expert opinion as weak (Ramesh Chandra Agrawal v Regency Hospital).

Two Supreme Court judgments are the bedrock of Section 39 practice.

Murari Lal v State of MP

A Supreme Court judgment on handwriting expert evidence. The Court held that expert opinion is, as a matter of evidence law, weak by itself and requires corroboration. The reasoning is that opinion evidence is opinion, not fact; the court must form its own view and use the expert as an aid, not a substitute. The judgment is cited across forensic domains, not only in handwriting cases, for the proposition that an uncorroborated expert opinion is rarely sufficient for a conviction.

Ramesh Chandra Agrawal v Regency Hospital

The Supreme Court restated and refined the Murari Lal principle. The judgment lays down that the trial court must first satisfy itself that the witness is genuinely qualified, then probe the methods used, and finally weigh the opinion against other evidence. Ramesh Chandra Agrawal is the case to cite when the question is "what factors does the court consider when receiving expert evidence?"

The Frye and Daubert comparison is worth holding clearly. Indian evidence law has no statutory analogue to the Frye general-acceptance test or the Daubert reliability factors. Section 39 BSA admits expert opinion without a statutory gatekeeping test. The reliability filter is judicial rather than statutory, and it runs through Murari Lal and Ramesh Chandra Agrawal rather than through a separate Daubert-style hearing. Put cleanly: India does not follow Frye or Daubert as a statutory test, and the reliability of expert opinion is assessed under Section 39 BSA read with Murari Lal v State of MP and Ramesh Chandra Agrawal v Regency Hospital.

Section 63 BSA is the renumbered, restated successor to Section 65B of the Indian Evidence Act 1872. It governs the admissibility of a copy of an electronic record (a printout, a CD copy, a forensic image, a forwarded email). The substantive rule is unchanged: a copy is admissible only with a statutory certificate signed by a person occupying a responsible official position in relation to the operation of the device. Without the certificate, the copy is not evidence.

The certificate must say four things:

• Identify the electronic record with reasonable particularity (file name, hash, date of generation).
• Describe the manner of production, including the device used and the conditions under which it was operating.
• State that the device was working properly during the relevant period, or that any malfunction did not affect the accuracy of the record.
• Be signed by a responsible official in relation to the operation of the relevant device.

The case law has moved in three stages. Anvar P V v P K Basheer (2014) is the Supreme Court judgment that displaced the older Navjot Sandhu position and held that a Section 65B certificate is mandatory. Shafhi Mohammad v State of Himachal Pradesh (2018) softened the position with a "interests of justice" carve-out where the party did not control the device. Arjun Pandit Rao Khotkar v Kailash Kushanrao Gorantyal (2020) was a three-judge bench that overruled Shafhi Mohammad and restored Anvar P V in full. The Khotkar position is the current law, and Section 63 BSA codifies it.

The practical consequence for an FSL analyst is that the Section 63 certificate is signed by the senior analyst or the section head, not by the IO. A common defence point is that the certificate has been signed by the IO (who is not a "responsible official in relation to the operation of the device") rather than by the FSL signatory. The 65B / 63 jurisprudence and the chain-of-custody jurisprudence have, in practical effect, merged for digital exhibits: a forensic image hash recorded at acquisition and re-verified at analysis is the de facto standard, and a Section 63 certificate without a hash trail is a defence opening.

Sections 142 to 151 BSA govern examination, cross-examination and re-examination of witnesses. The framework is unchanged from IEA Sections 137 to 146. Cross-examination is the defence's chance to test the expert opinion against the worksheets, the chain of custody, and the underlying methods.

Preparation that strengthens an expert's testimony in court:

• Brings the worksheet, not just the report. The worksheet is the contemporaneous record; the report is a summary. Defence cross-examination targets the worksheet first.
• Carries the calibration logs of every instrument used. A challenge to instrument calibration is the most common technical attack on a forensic report.
• Has the chain-of-custody documents physically ready. A break in chain of custody undermines the science regardless of how rigorous the science was.
• Stays inside the report. Opinions volunteered beyond the report's stated scope expose the witness to cross on areas they did not prepare for.
• Does not become an advocate. The expert's duty is to the court. An expert who looks like a prosecution mouthpiece loses weight, as the Anvar trial-court record and several subsequent appellate orders illustrate.

Three case names should be at the front of any working summary of expert evidence in India: Murari Lal v State of MP (expert opinion is weak by itself), Anvar P V v P K Basheer (Section 65B certificate is mandatory), and Arjun Pandit Rao Khotkar v Kailash Kushanrao Gorantyal (Section 65B / 63 certificate, three-judge bench, 2020). Selvi v State of Karnataka (narco-analysis is inadmissible without consent) belongs alongside them.