Chain of Custody in Drug Cases: Why Procedural Lapses Lead to Acquittal

The Supreme Court has long emphasized that in drug cases, the seized illegal substance is the very corpus delicti—the body of the crime—and its integrity must be preserved beyond reasonable doubt. In People v. Cabuhay (G.R. No. 225590, July 23, 2018), the Court reversed a conviction for illegal sale of dangerous drugs because the prosecution failed to establish an unbroken chain of custody. The ruling serves as a stern reminder to law enforcement that procedural shortcuts, however convenient, can cost the government a conviction.

The Facts of the Case

On May 19, 2009, police officers in Caloocan City conducted a buy-bust operation against Michael Cabuhay, who was suspected of selling shabu. PO3 Lauro Dela Cruz acted as the poseur-buyer, handing marked money to Cabuhay, who then gave him one plastic sachet of suspected methamphetamine hydrochloride. After Cabuhay's arrest, another sachet was recovered from his pocket.

Cabuhay was charged with illegal sale and illegal possession of dangerous drugs under Sections 5 and 11 of Republic Act No. 9165. The trial court acquitted him of illegal possession but convicted him of illegal sale, imposing life imprisonment and a fine of P500,000. The Court of Appeals affirmed, but the Supreme Court reversed and acquitted Cabuhay.

The Issue: Was the Chain of Custody Preserved?

The central question was whether the prosecution had sufficiently established that the drugs presented in court were the same items seized from the accused. The Court answered in the negative.

The Chain of Custody Rule Explained

The chain of custody rule is a method of authenticating evidence. Every person who handled the seized item must describe how and from whom it was received, what happened to it while in their possession, and the condition in which it was delivered to the next link. In drug cases, the prosecution must account for four links: (1) seizure and marking by the apprehending officer; (2) turnover to the investigating officer; (3) turnover to the forensic chemist for examination; and (4) turnover and submission to the court.

The Prosecution's Fatal Lapses

The Court identified two critical failures. First, the buy-bust team violated Section 21 of RA 9165, which requires that the physical inventory and photographing of seized drugs be done in the presence of the accused or his representative, a representative from the media, a representative from the Department of Justice, and an elected public official. In this case, the inventory was signed only by the arresting and investigating officers. No media representative, DOJ representative, or public official signed it, and no photographs were presented.

Second, the prosecution's stipulation regarding the forensic chemist's testimony was incomplete. While the parties agreed that the chemist received the sachets and that they tested positive for shabu, the stipulation did not cover whether the chemist resealed the items after examination or placed her own markings to prevent tampering. Citing People v. Pajarin and People v. Sanchez, the Court held that such precautions are essential to prove that the drug presented in court is the same one seized.

Why Strict Compliance Matters

The Court acknowledged that non-compliance with Section 21 does not automatically result in acquittal if the chain of custody remains unbroken. However, this liberality applies only when there are justifiable grounds for the lapse—and none were offered here. The prosecution's failure to explain the deviations, combined with the incomplete stipulations, created reasonable doubt as to the identity and integrity of the seized drugs.

Practical Takeaways

• Marking and inventory are non-negotiable. The apprehending team must immediately mark seized drugs and conduct a physical inventory in the presence of the accused, media, DOJ, and an elected official, with photographs taken.
• Every link must be accounted for. The prosecution must present testimony from every person who handled the evidence, from seizure to court presentation.
• Stipulations must be complete. When dispensing with a forensic chemist's testimony, the stipulation must include that the chemist received the item sealed and intact, resealed it after examination, and placed personal markings on it.
• Unexplained procedural lapses are fatal. Courts will not excuse deviations from Section 21 without justifiable grounds.
• Presumption of innocence prevails. When the integrity of the corpus delicti is in 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.