Chain of Custody in Drug Cases: Why Every Link Matters

In drug cases, the seized illegal drug is the corpus delicti — the very body of the crime. If the prosecution cannot prove that the item presented in court is the same item seized from the accused, the case fails. In People v. Catinguel (G.R. No. 229205, March 6, 2019), the Supreme Court acquitted an accused because the police broke the chain of custody in several ways. The case is a clear reminder that strict compliance with the rules on evidence handling is not optional.

The Facts of the Case

On March 3, 2014, police officers in Bugallon, Pangasinan conducted a buy-bust operation against Eduardo Catinguel y Viray. PO1 Lamsen acted as the poseur-buyer and purchased one plastic sachet of marijuana for PHP 100.00. After the arrest, the officers brought the accused and the seized item to the police station, where the marking, inventory, and photography were done in the presence of representatives from the media and the Department of Justice.

The accused was charged with violation of Section 5, Article II of Republic Act No. 9165 (the Comprehensive Dangerous Drugs Act of 2002), or the illegal sale of dangerous drugs. Both the Regional Trial Court and the Court of Appeals convicted him. On appeal, the Supreme Court reversed the conviction.

The Chain of Custody Rule

The chain of custody rule is a method of authenticating evidence. It requires that every person who handled the seized item testify about how and from whom they received it, what happened to it while in their possession, and how it was delivered to the next link. This ensures that the item presented in court is the same one seized from the accused, and that it was not tampered with or substituted.

The Court in Catinguel reiterated the four critical links in the chain:

1. Seizure and marking of the illegal drug by the apprehending officer;
2. Turnover of the seized drug by the apprehending officer to the investigating officer;
3. Turnover by the investigating officer to the forensic chemist for laboratory examination; and
4. Turnover and submission of the marked drug from the forensic chemist to the court.

Section 21 of RA 9165

Section 21 of RA 9165 requires that the apprehending team, immediately after seizure and confiscation, physically inventory and photograph the seized drugs in the presence of: (a) the accused or his representative or counsel; (b) a representative from the media; (c) a representative from the Department of Justice; and (d) any elected public official. The Implementing Rules and Regulations allow for non-compliance only under justifiable grounds, so long as the integrity and evidentiary value of the seized items are preserved.

The Breaks in the Chain

The prosecution failed to establish several links. First, the marking of the seized item was not done at the place of arrest. PO1 Lamsen explained that he feared two or three friends of the accused would cause trouble. The Court found this excuse flimsy, especially since the officer had a service firearm and was with another police officer.

Second, no elected public official was present during the inventory and photography. The police merely made a telephone call to barangay officials, and when no one arrived, they did not follow up despite the barangay hall being near the police station.

Third, the apprehending officer never actually turned over the item to the investigating officer. PO1 Lamsen testified that he kept holding the sachet the entire time, and the investigator refused to receive it. The officer merely showed it to the investigator.

Fourth, there was confusion about who received the item for laboratory examination. The forensic chemist said she personally received it from PO1 Lamsen, but PO1 Lamsen testified that he handed it to PO1 Daus. Finally, the evidence custodian who held the item after the laboratory examination was never presented in court, and no stipulation was made to cover his testimony.

Why the Conviction Was Reversed

The Supreme Court held that the prosecution failed to prove beyond reasonable doubt that the item presented in court was the same item seized from the accused. Because the illegal drug is the corpus delicti, its integrity and evidentiary value must be established with moral certainty. The lapses in the chain of custody were too significant to ignore, and the Court had no choice but to acquit.

Practical Takeaways

• Mark the item at the scene. Marking should be done immediately at the place of arrest unless there is a genuine, justifiable reason to do otherwise. A vague fear of trouble is not enough.
• Secure all required witnesses. The presence of the accused, a media representative, a DOJ representative, and an elected public official is mandatory. If a witness is unavailable, the police must document the justifiable ground and show that the integrity of the evidence was preserved.
• Document every transfer. Every person who handles the seized item must be identified, and the transfer must be properly recorded. The investigating officer must actually receive the item, not merely be shown it.
• Present all links in court. The evidence custodian and other persons who handled the item must testify, or the parties must stipulate to their testimony. Gaps in testimony can be fatal to the prosecution's case.
• Compliance protects the case. Strict adherence to Section 21 of RA 9165 and the chain of custody rule is not just a technicality — it is essential to proving 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.