NDPS Act | Prosecution Must Establish Unbroken Chain Of Custody For Samples, Failure To Comply With Section 52-A Renders FSL Report Inadmissible: Supreme Court

"The prosecution must establish the integrity of the sampling process as well as an unbroken chain of custody of the samples before the FSL report can safely be relied upon." Supreme Court, in a significant ruling dated September 16, 2026, held that the prosecution is strictly obligated to establish an unbroken chain of custody for samples in NDPS cases, and any failure to prove the safe handling of samples from the point of seizure until their receipt at the Forensic Science Laboratory (FSL) renders the forensic report inadmissible.

A bench of Justice Sandeep Mehta and Justice Manmohan observed that the failure of the investigating agency to comply with the mandatory procedure under Section 52-A of the NDPS Act, coupled with material discrepancies in the chain of custody, strikes at the very root of the prosecution’s case.

Total Non-Compliance with Section 52-A

The instant appeals arose from the conviction of the appellants under the NDPS Act for the alleged possession of charas. The trial Court and the High Court had both affirmed the conviction based primarily on the recovery of the contraband and the subsequent FSL report. The Supreme Court, however, found that the seizure officer had made no effort to undertake the mandatory procedure provided under Section 52-A of the NDPS Act, which requires the presentation of seized contraband before a Magistrate for the drawing of representative samples.

Procedural Safeguards Under NDPS Act

The Court emphasized that while minor lapses in procedure might not always result in automatic acquittal, total non-compliance with Section 52-A is a critical factor. This provision was incorporated into the Act to provide a statutory mechanism to eliminate the possibility of investigational taint in the sampling process and to ensure the sanctity of seized drugs. By bypassing this stage, the investigating agency effectively denied the court primary evidence of the seizure, thereby necessitating rigorous scrutiny of the link evidence.

Critical Breach in Chain of Custody

Further investigation into the documentary evidence revealed a fatal gap in the chain of custody. The forwarding letter from the Office of the Superintendent of Police was dated December 1, 2004, yet the FSL report recorded that the samples were received on December 6, 2004. The prosecution failed to provide any explanation for the whereabouts of the samples during this five-day period. The Court noted that the carrier of the samples was never examined in evidence, and no entries existed in the maalkhana register to account for the exit of the samples.

Gap in Custody Destroys Integrity of Samples

The bench observed that this grave discrepancy and the unexplained gap in custody completely breached the link in the chain of custody. The Court held that for an FSL report to be admitted in evidence, the prosecution is required to establish through credible oral and documentary evidence that the samples were sealed and kept in a secure condition at all times. Absent such proof, the integrity of the sampling process is wholly compromised, casting serious doubt on the prosecution’s version of events.

"The prosecution has failed to establish an essential ingredient of the offence and, consequently, the conviction of the accused-appellants cannot be sustained."

Dismissal of Unverified Preliminary Tests

The prosecution had also relied on the testimony of the seizure officer, who claimed to have identified the substance as charas by burning a small portion of it at the spot. The Court rejected this, noting that such a procedure lacks any scientific basis or reliability. In the absence of a valid FSL report, there was no legally admissible evidence to establish that the recovered substance was indeed charas as defined under Section 2(iii)(a) of the NDPS Act.

Consequently, the Supreme Court allowed the appeals and set aside the judgment of conviction and order of sentence passed by the trial Court and affirmed by the High Court. The appellants were ordered to be acquitted of all charges and their bail bonds were discharged. The ruling reaffirms the high burden placed upon the state to adhere strictly to procedural mandates in cases involving severe penal consequences under the NDPS Act.

Date of Decision: 16 September 2026