Chain of Custody Gaps Lead to Acquittal in Drug Sale Case

The Supreme Court's decision in People v. Managat, Jr. y De Leon (G.R. No. 230615, March 4, 2019) serves as a powerful reminder that in drug cases, the prosecution's duty extends beyond proving the sale itself. The Court must also be satisfied that the illegal drug presented in court is the very same item seized from the accused. When the chain of custody over that item is broken, the conviction falls apart—even if the sale appears to have been established.

The case involved a buy-bust operation in Los Baños, Laguna, where police officers arrested two men for allegedly selling dried marijuana leaves weighing 3.92 grams. Both the Regional Trial Court and the Court of Appeals convicted the accused. The Supreme Court, however, reversed the conviction and ordered their acquittal.

The Four Links of the Chain of Custody

The Court reiterated that in illegal drug cases, the prosecution must prove an unbroken chain of custody over the seized item. This chain has four links:

1. The seizure and marking of the illegal drug by the apprehending officer
2. The turnover of the seized drug to the investigating officer
3. The turnover by the investigating officer to the forensic chemist
4. The turnover and submission from the forensic chemist to the court

Each person who handles the seized item must testify about how they received it, what happened while it was in their possession, and its condition when they passed it on.

Gaps That Proved Fatal

In this case, the prosecution failed to present the investigating officers who received the seized marijuana from the arresting officer. Without their testimony, the Court could not verify what happened to the item between the arrest and its delivery to the crime laboratory. This created a gap in the chain.

The Court also noted that the forensic chemist's testimony was dispensed with through stipulation. While the parties agreed on the contents of the Chemistry Report, this stipulation only covered the examination results. It did not establish how the specimen was handled or preserved at the laboratory. The person who received the item at the crime laboratory was never identified.

Non-Compliance with Section 21 of RA 9165

Beyond the broken chain, the police also failed to comply with Section 21, Article II of Republic Act No. 9165. This provision requires the apprehending team to mark, inventory, and photograph the seized item in the presence of the accused or their counsel, and witnessed by an elected public official and representatives from the Department of Justice and the media.

The Court emphasized that these insulating witnesses serve a critical purpose: they deter the practice of planting evidence. While strict compliance is not always possible, the prosecution must provide justifiable reasons for non-compliance. In this case, no explanation was offered at all.

Why the Acquittal Followed

The Court explained that because of these lapses, the evidentiary value and integrity of the seized drug were compromised. It could not determine with certainty whether the marijuana allegedly seized from the accused was the same item submitted to the laboratory and later presented in court. With this doubt, the accused's guilt was not proven beyond reasonable doubt.

The decision clarifies that the presumption of regularity in the performance of police duties cannot fill gaps in the chain of custody. The prosecution must present actual evidence to account for every link.

Practical Takeaways

• Every handler must testify. In drug cases, the prosecution should present each person who handled the seized item, including investigating officers and laboratory personnel, to establish a complete chain of custody.
• Stipulations have limits. Agreeing on a forensic chemist's report does not eliminate the need to establish how the specimen was handled and preserved before and during examination.
• Section 21 compliance matters. Police must mark, inventory, and photograph seized items in the presence of the required witnesses. If they cannot, they must explain why.
• Presumption of regularity is not automatic. Courts will not assume that police officers properly performed their duties when material gaps in the evidence exist.
• For defense counsel. Highlighting missing witnesses and unexplained deviations from Section 21 can be a powerful basis for acquittal.

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