Chain of Custody Imperative Safeguarding Drug Evidence Against Doubt

In illegal drug cases, the seized substance is the very heart of the prosecution's case. If the State cannot prove that the item presented in court is the same item seized from the accused, the case fails. In People v. Largo (G.R. No. 201293, June 19, 2019), the Supreme Court acquitted Joel A. Largo of illegal possession of shabu because the prosecution failed to establish an unbroken chain of custody over the seized drug. The case is a pointed reminder that procedural lapses in handling evidence can mean the difference between conviction and freedom.

The Facts of the Case

On November 28, 2005, barangay tanods patrolling the Carbon Public Market in Cebu City were told of a pot session at Unit 3. When they approached, people fled. One man, Joel Largo, allegedly flicked away a plastic sachet containing white crystalline substance. A tanod retrieved it and held onto it until reaching the police station, where it was turned over to an investigator who marked it "JLA." The sachet was later brought to the PNP Crime Laboratory, which confirmed it contained methamphetamine hydrochloride, or shabu.

Largo was charged with violation of Section 11, Article II of Republic Act 9165 (the Comprehensive Dangerous Drugs Act of 2002). The trial court convicted him, and the Court of Appeals affirmed. Largo appealed to the Supreme Court, arguing that the chain of custody over the seized drug was broken.

The Issue

The central question was whether the prosecution had sufficiently established the identity and integrity of the seized dangerous drug, particularly whether the chain of custody rule under Section 21 of RA 9165 was complied with.

The Ruling: Acquittal for Broken Chain

The Supreme Court reversed Largo's conviction. The Court explained that in drug cases, the State must prove not only the elements of the offense but also the corpus delicti—the seized drug itself. The prosecution must establish, with moral certainty, that the substance offered in court is the very same item seized from the accused.

The Court identified four links in the chain of custody, citing People v. Gayoso:

1. Seizure and marking of the drug by the apprehending officer
2. Turnover to the investigating officer
3. Turnover to the forensic chemist for examination
4. Turnover and submission to the court

Here, all three critical links failed.

First Link: No Marking, No Inventory, No Photograph

The apprehending tanod admitted he did not mark the sachet at the place of seizure. Marking is the starting point of the custodial link, done to prevent switching, planting, or contamination of evidence. The prosecution also failed to show that the required physical inventory and photograph of the seized item were ever conducted, as mandated by Section 21 of RA 9165.

Third Link: Silent Investigating Officer

The investigating officer who received the drug was never presented in court. No one testified on how the drug was handled from the time it was turned over until it was sent to the crime laboratory—leaving a gap where tampering could have occurred.

Fourth Link: Silent Forensic Chemist

The forensic chemist did not testify on how he received, handled, examined, and preserved the drug. There was also no evidence showing who turned over the drug for presentation in court. Without this testimony, the final link was broken.

The Saving Clause Did Not Apply

While the law allows leniency for non-compliance under justifiable grounds, the arresting officers here offered no explanation for their omissions. They did not even acknowledge that they failed to comply. The Court stressed that the presumption of regularity in official duty cannot stand when the records show clear procedural lapses, and it cannot outweigh the presumption of innocence.

Practical Takeaways

• Mark evidence immediately. The apprehending officer must mark the seized item at the place of arrest, in the presence of the accused, to establish the starting point of the chain of custody.
• Document everything. The required physical inventory and photograph of the seized drug must be conducted and presented in evidence. Their absence, without justification, is fatal.
• Present all handlers. Every person who held the seized drug—from the arresting officer to the investigating officer to the forensic chemist—should testify on how they handled and preserved it.
• Secure the forensic link. The forensic chemist must testify on when and from whom the drug was received, how it was analyzed, and how it was kept until presented in court.
• Do not rely on presumption. The presumption of regularity in official duty cannot cure clear violations of Section 21 of RA 9165, especially when no justification is offered.

The Largo case underscores that the chain of custody rule is not mere technicality—it is a safeguard against wrongful conviction. When the State fails to 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.