When Buy-Bust Evidence Fails: Chain of Custody and Acquittal in Drug Cases

In a significant ruling on the prosecution of illegal drug cases, the Supreme Court acquitted an accused for violation of Section 5, Article II of Republic Act No. 9165 (the Comprehensive Dangerous Drugs Act of 2002) after finding that the police failed to comply with the mandatory chain of custody requirements. The case of People v. Dumanjug (G.R. No. 235468, July 1, 2019) underscores the Court's firm stance that the integrity of seized drugs must be preserved with exacting precision, or the accused must be acquitted.

The Facts of the Case

On 7 December 2010, operatives of the Philippine Drug Enforcement Agency (PDEA) conducted a buy-bust operation against Dan Dumanjug in Butuan City. A poseur-buyer purchased one sachet of shabu for P500.00, and Dumanjug was arrested. The seized sachet was marked at the scene, but the inventory and photographing of the evidence were not done there. Instead, these were conducted later at the PDEA Regional Office, in the presence of the required witnesses—a barangay kagawad, a media representative, and a DOJ representative.

The Regional Trial Court convicted Dumanjug, and the Court of Appeals affirmed. On appeal, the Supreme Court reversed and acquitted him.

The Issue

The central question was whether the prosecution had proven Dumanjug's guilt beyond reasonable doubt, specifically whether the chain of custody rule under Section 21 of RA 9165 had been complied with.

The Ruling: Strict Compliance Required

The Supreme Court reiterated that in drug cases, the dangerous drug itself is the corpus delicti—the very body of the crime. The prosecution must prove not only the elements of illegal sale (identity of buyer and seller, object, consideration, delivery, and payment) but also that the drug offered in court is the very same substance seized from the accused.

Section 21, Article II of RA 9165 requires the apprehending team to physically inventory and photograph seized items immediately after seizure and confiscation, in the presence of: (1) the accused or his representative/counsel, (2) an elected public official, (3) a media representative, and (4) a DOJ representative.

The Court stressed that the presence of these three witnesses must be secured at the time of the warrantless arrest, not merely when the inventory is later conducted. As explained in People v. Tomawis, their insulating presence protects against the evils of switching, planting, or contamination of evidence.

Why the Prosecution Failed

The Court found no justifiable ground for the deviation. The PDEA agents gave conflicting reasons for not conducting the inventory at the crime scene:

• Agent Tibayan claimed the team leader assessed the place as "quite dangerous."
• Agent Balbada claimed a crowd of about 200 onlookers had gathered—a claim uncorroborated by her colleague and contradicted by the area's description as a small, quiet location with only four to five houses and a single alley.

The Court found these explanations "farfetched and implausible." Notably, the buy-bust team did not even bring a camera, and the three witnesses were called only after the operation had concluded. The PDEA Regional Office was also not the nearest police station, as the IRR of RA 9165 permits inventory elsewhere only when holding it at the place of seizure is not practicable.

Practical Takeaways

• The chain of custody rule is non-negotiable. Police must inventory and photograph seized drugs immediately at the place of arrest, in the presence of the required witnesses.
• Justifiable grounds must be proven, not assumed. If the police deviate from Section 21, the prosecution must explain the reasons and prove the integrity of the evidence was preserved.
• Conflicting police testimonies can destroy a case. Inconsistent explanations for procedural lapses seriously erode the credibility of the prosecution.
• The "war on drugs" cannot trump constitutional rights. The Court warned that sacrificing the presumption of innocence for convenience makes the enforcement effort self-defeating.
• For the accused, procedural lapses can mean acquittal. When the integrity of the seized drug is compromised, the prosecution fails to prove guilt beyond reasonable doubt.

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