Reasonable Doubt and Acquittal in Drug Cases: The Price of Procedural Lapses

In drug cases, the prosecution must prove guilt beyond reasonable doubt. This means the illegal drug itself—the corpus delicti—must be identified with moral certainty. When police officers break the procedural rules for handling seized drugs, that certainty collapses. In People v. Sampa (G.R. No. 242160, July 8, 2019), the Supreme Court acquitted an accused because the buy-bust team failed to follow the chain-of-custody requirements under Section 21 of Republic Act No. 9165.

The Case: A Buy-Bust That Went Wrong

On February 24, 2014, PDEA agents conducted a buy-bust operation against Jan Jan Tayan and Aiza Sampa in Quezon City. The poseur-buyer purchased one plastic sachet of shabu weighing 50.6374 grams. Both were arrested and charged with illegal sale of dangerous drugs under Section 5, Article II of R.A. 9165.

The trial court convicted both accused. The Court of Appeals affirmed. But on appeal, the Supreme Court acquitted Sampa.

The Issue: Did Police Follow Section 21?

The central question was whether the PDEA agents complied with the chain-of-custody rule. Section 21 requires police to mark, inventory, and photograph seized drugs immediately after seizure in the presence of:

• The accused or their representative or counsel;
• A representative from the media;
• A representative from the Department of Justice (DOJ); and
• An elected public official.

These witnesses must sign the inventory and receive copies.

The Ruling: Serious Procedural Lapses

The Supreme Court found multiple violations:

1. Marking was not done at the place of arrest. The poseur-buyer marked the sachet inside the service vehicle, not at the Jollibee where the arrest happened.

2. Inventory and photographing were delayed. These were done at the PDEA office in Camp Vicente Lim, Laguna—hours later and far from the arrest site.

3. The three-witness rule was violated. Only a media representative was present. No DOJ representative or elected public official attended. The poseur-buyer admitted they did not even try to secure a DOJ representative, saying they are "usually not available."

4. The "commotion" excuse was not proven. The prosecution claimed a commotion prevented immediate compliance. But it offered no details or evidence to support this. The Court noted that "existence of a commotion" has become a convenient excuse in drug cases—mere invocation does not amount to substantial compliance.

The Saving Clause Cannot Save This Case

Section 21 of the IRR contains a saving clause: non-compliance with the requirements under justifiable grounds will not invalidate the seizure, as long as the integrity and evidentiary value of the seized items are preserved.

But here, the prosecution failed to explain the deviations. It did not identify justifiable grounds. It did not show that the integrity of the drug was preserved despite the lapses. The chain of custody was broken right at its inception—at the marking stage.

Why This Matters

The presence of the three insulating witnesses is not a mere formality. As the Court explained in People v. Dela Cruz, their presence protects against the evils of planting, switching, or contamination of evidence. It also protects police officers from accusations of frame-up. When the witnesses are absent, doubt arises as to the source, identity, and integrity of the seized drug.

The Court emphasized that the witnesses must be present at the time of seizure and confiscation, not just called in later for the inventory. Calling them in after the operation defeats the purpose of the law.

Practical Takeaways

• Chain of custody is the backbone of drug prosecutions. Any break in the chain—from seizure to laboratory examination—can result in acquittal.
• Marking must be immediate. The apprehending officer should mark the seized item at the place of arrest, in the presence of the accused and the required witnesses.
• The three witnesses are mandatory. Police must make genuine efforts to secure a media representative, a DOJ representative, and an elected public official. "Unavailability" must be proven, not assumed.
• Excuses must be supported by evidence. A claim of "commotion" or "impracticability" must be substantiated. The saving clause only applies when justifiable grounds are shown and the integrity of the evidence is preserved.
• When in doubt, acquit. If the prosecution cannot prove the identity and integrity of the seized drug beyond reasonable doubt, the accused is entitled to acquittal.

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