Chain of Custody in Drug Cases: How Gaps in Evidence Led to an Acquittal

The prosecution of illegal drug cases in the Philippines does not rest on the testimony of police officers alone. It also depends on the integrity of the seized drug itself. In People v. Año (G.R. No. 230070, March 14, 2018), the Supreme Court acquitted an accused charged with selling shabu because the prosecution failed to justify gaps in the chain of custody of the seized evidence. The case is a reminder that procedural safeguards under Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002, are matters of substantive law — not mere technicalities.

The buy-bust operation

Acting on information about drug activity in San Mateo, Rizal, police officers formed a buy-bust team on August 3, 2009. One officer posed as a buyer and allegedly purchased 0.03 gram of methamphetamine hydrochloride, or shabu, from Nestor Año for P200.

After the transaction, the officer identified himself as a policeman. Año fled but was caught. The team recovered the marked money from him. Because Año's relatives caused a commotion, the team moved about 100 meters away from the place of arrest, marked the seized sachet, and conducted the inventory there. A barangay captain witnessed and signed the inventory, and photographs were taken.

The seized sachet was delivered to the crime laboratory, which confirmed it tested positive for shabu. Año denied the charges, claiming he was at home celebrating his nephew's birthday when police forcibly arrested him.

The rulings below

The Regional Trial Court found Año guilty beyond reasonable doubt of illegal sale of dangerous drugs under Section 5, Article II of RA 9165, sentencing him to life imprisonment and a fine of P500,000.

The Court of Appeals affirmed. It held that all the elements of illegal sale were present and that the apprehending officers complied with the chain of custody rule under the law's Implementing Rules and Regulations, since the poseur-buyer testified in detail about each link in the chain.

What the Supreme Court found

The Supreme Court reversed the conviction. It reiterated that in illegal sale cases, the prosecution must prove the identity of the buyer and seller, the object, and the consideration, as well as the delivery of the drug and payment. Critically, the drug itself must be presented in court, and its identity established with moral certainty through an unbroken chain of custody.

Section 21, Article II of RA 9165 — prior to its amendment by RA 10640 — required that immediately after seizure, the apprehending team conduct a physical inventory and photograph the seized items in the presence of: the accused or his representative or counsel; an elected public official; and representatives from the media and the Department of Justice. These witnesses must sign the inventory and receive copies. The seized drugs must also be turned over to the crime laboratory within 24 hours.

The Court acknowledged that strict compliance may not always be possible under varied field conditions. Non-compliance does not automatically invalidate the seizure, provided the prosecution proves two things: that there was a justifiable ground for the deviation, and that the integrity and evidentiary value of the seized items were preserved.

In Año's case, the records showed that a barangay captain witnessed the marking and inventory. However, the records were silent as to the required representatives from the media and the DOJ. No explanation was offered for their absence. Without a credible justification, the saving clause could not apply.

The Court stressed that the prosecution has the positive duty to prove compliance with Section 21 and to justify any deviation, even if the issue was not raised in the lower courts. Compliance determines the integrity of the corpus delicti — the body of the crime — and ultimately the accused's liberty. On this basis, the Court acquitted Año.

Practical takeaways

• The presence of required witnesses matters. Under the law as it stood before RA 10640, the inventory and photography of seized drugs had to be done in the presence of the accused or his representative, an elected public official, and representatives from the media and the DOJ.
• Non-compliance must be justified. Any deviation from the procedure must be explained by the prosecution, and the explanation must be proven as a fact — it cannot be presumed.
• The integrity of the drug is the heart of the case. If the chain of custody has unexplained gaps, the identity of the corpus delicti is put in doubt, and acquittal generally follows.
• Courts may raise the issue on appeal. Even if the chain of custody was not questioned in the trial court, appellate courts may examine the records and overturn a conviction if compliance was not shown.
• RA 10640 changed the witness requirements. The 2014 amendment adjusted which witnesses must be present, but the core duty to preserve the integrity of the seized drugs remains.

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