The Supreme Court acquitted two men convicted under the NDPS Act after finding that investigators failed to explain a five-day gap in the custody of seized drug samples between collection and forwarding for chemical analysis. The Court held this breach of Section 52A of the NDPS Act — which mandates prompt seizure documentation and sample certification before a magistrate — fatally undermined the prosecution's case. Both men had spent nearly 20 years imprisoned before the acquittal.

Section 52A of the Narcotic Drugs and Psychotropic Substances Act, 1985 lays down a strict chain-of-custody protocol for seized contraband. When drugs are seized, the officer must produce the contraband before a magistrate, draw representative samples in the magistrate's presence, and have those samples certified. This procedure exists to prevent tampering, substitution, or planting of evidence — risks that are especially acute in narcotics cases where the quantity and quality of the substance determines both guilt and sentence severity.

The Supreme Court has consistently treated compliance with Section 52A not as a procedural formality but as a substantive safeguard. In Union of India v. Mohanlal (2016), the Court laid down that non-compliance with Section 52A creates a presumption of tampering and casts a serious doubt on the prosecution's case. The chain of custody must be unbroken and documented at every stage.

In this case, an unexplained five-day gap between seizure and forwarding of samples to the chemical examiner broke that chain. The prosecution could not account for where the samples were, who held them, or whether they remained unaltered. The Court found this fatal — not merely irregular — because the integrity of the sample is the very foundation of proof in an NDPS prosecution. Without reliable chemical analysis, there is no proof of the nature or quantity of the substance, and without that, conviction cannot stand.

This ruling reinforces that in NDPS cases, procedural compliance is substantive: a violated chain of custody is not a technicality the court can overlook — it goes to the root of the prosecution's evidence.