Chain of Custody in Drug Cases: Why Integrity of Evidence Matters

In a significant ruling on drug cases, the Supreme Court acquitted a man convicted of selling marijuana because law enforcers failed to observe the mandatory chain of custody requirements. The case of People v. Lescano (G.R. No. 214490, January 13, 2016) underscores a crucial principle: in drug prosecutions, the prosecution must prove not only that a sale occurred, but also that the exact substance seized is the same substance presented in court. When only a tiny amount of drugs is involved, the Court demands even stricter compliance with the rules.

The Facts of the Case

On July 8, 2008, police operatives in Olongapo City conducted a buy-bust operation against Howard Lescano. A poseur buyer allegedly purchased one gram and four-tenths (1.4) grams of marijuana from Lescano for P100.00. The police marked the plastic sachet with the initials "HJ" and brought it to their office, where an inventory was supposedly conducted.

Lescano was charged with illegal sale of dangerous drugs under Section 5 of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002. Both the Regional Trial Court and the Court of Appeals convicted him, sentencing him to life imprisonment and a fine of P500,000.00. The conviction relied heavily on the presumption of regularity in the performance of official duties by the police.

The Issue

The central question was whether the prosecution sufficiently established Lescano's guilt beyond reasonable doubt, particularly whether it complied with Section 21 of RA 9165 on the custody and disposition of seized drugs.

The Ruling: Strict Compliance Required

The Supreme Court reversed the conviction and acquitted Lescano. The Court held that the prosecution failed to establish the identity of the corpus delicti—the illicit drug itself—because the police did not comply with Section 21's mandatory requirements.

Under Section 21, as amended by Republic Act No. 10640, the apprehending team must, immediately after seizure, conduct a physical inventory and photograph the seized items in the presence of: (1) the accused or his representative or counsel; (2) an elected public official; and (3) a representative of the National Prosecution Service or the media. These witnesses must sign the inventory and receive copies.

In this case, the inventory was conducted without the presence of Lescano, his counsel, or any of the required witnesses. The Court noted that the mere marking of seized items, done in violation of the safeguards of the Comprehensive Dangerous Drugs Act, cannot be the basis of a finding of guilt.

Why the Presumption of Regularity Did Not Save the Prosecution

The Court rejected the lower courts' reliance on the presumption of regularity in the performance of official duties. As emphasized in People v. Holgado, which the Court quoted extensively, the prosecution's sweeping guarantees as to the identity and integrity of seized drugs and drug paraphernalia will not secure a conviction. Not even the presumption of regularity in the performance of official duties will suffice.

The presumption cannot arise when the official act is irregular on its face. Here, the prosecution admitted non-compliance with Section 21 and presented no justifiable grounds for the deviation.

The Significance of Minuscule Amounts

The Court gave particular weight to the fact that only 1.4 grams of marijuana was involved. Citing People v. Holgado, the Court explained that the likelihood of tampering, loss or mistake with respect to an exhibit is greatest when the exhibit is small and is one that has physical characteristics fungible in nature and similar in form to substances familiar to people in their daily lives. Small amounts of drugs can be readily planted or tampered with, demanding more exacting compliance with the rules.

The Four Links in the Chain of Custody

The Court reiterated the four links that must be established in the chain of custody: (1) seizure and marking of the drug by the apprehending officer; (2) turnover to the investigating officer; (3) turnover to the forensic chemist for laboratory examination; and (4) turnover and submission of the marked drug to the court. Any break in these links casts doubt on the integrity of the evidence.

Practical Takeaways

• Compliance with Section 21 is mandatory. Police must conduct physical inventory and photographing immediately after seizure, in the presence of the required witnesses. Merely marking the seized item is insufficient.
• The presumption of regularity has limits. It cannot override clear procedural violations, especially when the prosecution admits non-compliance without justifiable grounds.
• Small drug amounts invite stricter scrutiny. Courts apply heightened scrutiny when only minuscule quantities are involved, as these are more susceptible to planting or tampering.
• For accused persons, procedural lapses can be a defense. If the prosecution fails to establish the chain of custody, the identity of the drug is in doubt, and conviction cannot stand.
• For law enforcers and prosecutors, documentation is critical. Every link in the chain must be accounted for, from seizure to court presentation, with proper witnesses present at every stage.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.