A Sessions Judge’s Guide to Appreciating Forensic Evidence in Criminal Trials

Forensic reports often enter courtrooms with an aura of scientific certainty. When a Chemical Examiner or Forensic Science Laboratory (FSL) concludes that blood matches, DNA aligns, or a substance supports the prosecution’s theory, there is a natural tendency to treat such findings as conclusive. However, the ruling of the Allahabad High Court in Najeeruddin v. State of U.P. reminds courts that this approach can be legally unsafe.

The judgment highlights a critical distinction that every Sessions Judge must maintain: admissibility, reliability, and fairness are separate legal requirements. A forensic report may be admissible under Section 293 of the Code of Criminal Procedure (CrPC), which allows reports of government scientific experts to be read in evidence without formal proof. But admissibility alone does not guarantee that the report is reliable or that it can be fairly used against the accused.

The case arose from a serious criminal prosecution involving multiple murders and allegations of sexual assault. The trial court had relied heavily on DNA and fingerprint reports to convict the accused and impose the death penalty. However, the High Court found a crucial flaw: these forensic reports were introduced after the accused had already been examined under Section 313 CrPC and were never put to him thereafter. This denied the accused the opportunity to explain or challenge the most incriminating evidence against him.

The Court held that this omission caused real prejudice and violated the principles of a fair trial. Section 313 CrPC is not a mere procedural formality—it is a substantive safeguard that ensures the accused can respond to every incriminating circumstance. If a forensic report is to be relied upon, its contents must be specifically put to the accused. If the report arrives later, the accused must be recalled and re-examined.

Another key lesson from the judgment is that admissibility does not equal evidentiary value. A forensic laboratory can only analyse the sample it receives; it cannot establish whether the sample was properly collected, preserved, or linked to the crime. These foundational facts must be independently proved by the prosecution. In this case, the prosecution failed to establish the chain of custody, did not examine the officer who collected the samples, and did not produce or identify the seized articles in court.

As a result, the High Court observed that the forensic reports, though present on record, had no real evidentiary worth—effectively reducing them to “waste paper.” This striking phrase underscores an important judicial principle: a report’s presence in the file is not the same as its probative value in law.

For Sessions Judges, the practical takeaway is clear. Before relying on forensic evidence, the court must ensure that the seizure or collection of material is properly proved, the chain of custody is intact, and the material is clearly connected to the accused. Equally important, the accused must be given a fair opportunity to respond to the evidence.

The judgment also cautions against over-hasty trial procedures. Speedy trials are important, but not at the cost of fairness and evidentiary integrity—especially in cases involving severe punishments.

Ultimately, the ruling reinforces a fundamental principle of criminal law: forensic science strengthens a case only when it rests on solid legal foundations. A forensic report is not a shortcut to conviction; it is merely one piece of evidence that must be carefully tested, properly proved, and fairly presented before it can support a finding of guilt.