Chain of Custody in Drug Cases: Marking Seized Items Immediately and in the Accused's Presence

In a significant ruling on criminal procedure, the Supreme Court has reaffirmed that police officers conducting buy-bust operations must mark seized drugs immediately upon confiscation and in the presence of the apprehended suspect. Failure to do so can break the chain of custody and lead to acquittal, even where other evidence points to guilt.

The case of People v. Palomares (G.R. No. 200915, February 12, 2014) illustrates how strictly the Court applies this rule. It serves as a reminder that in drug cases, the prosecution's success hinges not just on catching the accused in the act, but on meticulously preserving the integrity of the seized evidence from the moment of confiscation to its presentation in court.

The Facts of the Case

On March 16, 2007, police officers in Manila conducted a buy-bust operation against Merlita Palomares, who was reportedly selling shabu. PO2 Mallari acted as the poseur-buyer, handing marked money to Palomares, who then retrieved a plastic sachet of white crystalline substance and gave it to him. After the exchange, Mallari arrested her.

The officers testified that Mallari marked the sachet with "MCP" and turned it over at the police station. Laboratory examination confirmed the substance was methamphetamine hydrochloride, or shabu. The trial court convicted Palomares of illegal sale of dangerous drugs under Section 5, Article II of Republic Act 9165, sentencing her to life imprisonment and a fine of P500,000. The Court of Appeals affirmed the conviction.

The Issue

The central question was whether the prosecution proved beyond reasonable doubt that Palomares sold dangerous drugs. Specifically, the Court examined whether the prosecution established an unbroken chain of custody over the seized sachet.

The Court's Ruling

The Supreme Court reversed the conviction and acquitted Palomares. The Court emphasized that to secure a conviction for illegal sale of dangerous drugs, the prosecution must prove with moral certainty that the substance seized is the same substance offered as evidence in court. This requires establishing an unbroken chain of custody.

The Court reiterated the minimum requirement: police must mark the seized item (1) in the presence of the apprehended violator and (2) immediately upon confiscation. While the Court has allowed marking at the nearest police station, the evidence in this case was unclear on several points:

• Where the marking was done
• Whether it was done in Palomares' presence
• Which officer actually did the marking, as the two officers gave conflicting testimonies

This uncertainty over a vital element of the crime warranted overturning the conviction.

The Court also noted that the officers failed to conduct a physical inventory or take photographs of the seized item. Their joint affidavit of arrest made no mention of inventory or photography, and they offered no justification for the omission.

The Weight of a Neutral Witness

Significantly, a barangay kagawad testified that he saw police enter Palomares' shanty and arrest her there—contradicting the prosecution's claim that the arrest happened outside Unit 52 at Paradise Heights. The Court noted that while denial and alibi are weak defenses, they cannot relieve the prosecution of its burden to prove the illegal transaction actually took place beyond reasonable doubt.

Practical Takeaways

• Mark immediately: Police must mark seized drugs right at the scene of seizure, or at the nearest police station if circumstances require. Delay without explanation weakens the case.
• Mark in the accused's presence: The marking must be done in the presence of the apprehended person. This protects both the integrity of the evidence and the rights of the accused.
• Document everything: Physical inventory and photographs of seized items are essential. Their absence, without justification, can be fatal to the prosecution.
• Consistent testimony matters: Conflicting accounts from arresting officers about who marked the evidence and where create reasonable doubt.
• For the accused: If police fail to follow these procedures, the defense may challenge the chain of custody—even when other evidence appears strong.

This case underscores that procedural compliance in handling evidence is not mere technicality. It is a constitutional safeguard ensuring that no person is convicted based on evidence whose integrity cannot be verified.

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