Reasonable Doubt: Drug Evidence Procedure Failures Lead to Acquittal

The Supreme Court's 2018 decision in People v. Que (G.R. No. 212994) reaffirms a crucial principle in Philippine drug prosecutions: the prosecution must prove guilt beyond reasonable doubt, and this includes strictly complying with the chain of custody rules under the Comprehensive Dangerous Drugs Act. When police fail to follow these procedures, the identity and integrity of the seized drugs become doubtful—and the accused must be acquitted.

The Case: A Buy-Bust Operation in Zamboanga

Joshua Que was arrested in July 2003 after a buy-bust operation in Zamboanga City. Police claimed Que sold shabu to a poseur-buyer and that another sachet was recovered from him. He was charged with illegal sale and illegal possession of dangerous drugs under Sections 5 and 11 of Republic Act No. 9165.

The Regional Trial Court convicted Que and sentenced him to life imprisonment for the sale charge and up to 15 years for possession. The Court of Appeals affirmed. On appeal, the Supreme Court reversed and acquitted Que.

The Issue: Was the Corpus Delicti Properly Established?

The central question was whether the prosecution proved beyond reasonable doubt that the substances seized from Que were the same items examined by the forensic chemist and presented in court. This requires establishing the corpus delicti—the body of the crime—through an unbroken chain of custody.

The Ruling: Non-Compliance With Section 21 Is Fatal

The Supreme Court held that the prosecution failed to comply with Section 21(1) of RA 9165, which requires that seized drugs be physically inventoried and photographed immediately after seizure in the presence of the accused or their representative, an elected public official, and a representative from the media or the Department of Justice.

In this case, the marking of the sachets was done at the police station without Que present and without any of the required witnesses. There was no inventory and no photograph. The Court found that the prosecution offered only the "self-serving assurances" of the arresting officers—precisely the situation the law seeks to prevent.

The Court emphasized that the presumption of regularity in the performance of official duties cannot save the prosecution. As explained in People v. Kamad, this presumption applies only when officers have shown compliance with the standard conduct of official duty required by law. Where the official act is irregular on its face, the presumption cannot arise.

Why Strict Compliance Matters

The Court explained that narcotics are not readily identifiable by sight. They are fungible substances that can easily be tampered with, substituted, or planted. The chain of custody requirement—covering seizure and marking, turnover to the investigating officer, turnover to the forensic chemist, and submission to court—ensures the seized item's integrity from confiscation to presentation in court.

Merely marking the seized items is not enough. As the Court noted in People v. Magat, marking alone does not comply with the clear procedures prescribed in Section 21. Each link in the chain must be established with certainty.

Practical Takeaways

• Chain of custody is mandatory. Police must conduct a physical inventory and photograph seized drugs immediately after seizure, in the presence of the required witnesses.
• Presumption of regularity is not a safety net. It applies only when officers have actually complied with legal procedures. Flagrant deviations negate it.
• The prosecution bears the full burden. Conviction must rest on the strength of the prosecution's evidence, not on the weakness of the defense.
• Doubt about the drug's identity means acquittal. If the prosecution cannot prove that the substance seized is the same substance examined and offered in court, the corpus delicti is not established.
• RA 10640 relaxed but did not eliminate the rules. The 2014 amendment made the required witnesses alternatives rather than cumulative, but the core requirements—inventory, photograph, and presence of witnesses—remain.

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