Chain of Custody in Drug Cases: Why Non-Compliance Can Mean Acquittal

In drug prosecutions, the seized substance is the very heart of the case. 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. Reyes y Ginove (G.R. No. 219953, April 23, 2018), the Supreme Court reminded law enforcers that strict compliance with the chain of custody rule under Section 21 of Republic Act No. 9165 is not a mere technicality—it is a safeguard against planting of evidence and wrongful conviction.

The Facts of the Case

On September 23, 2006, police officers conducted a buy-bust operation in Quezon City against alias "Babang," later identified as Angelita Reyes. A poseur-buyer handed marked money to Josephine Santa Maria, who told Reyes to give the shabu. Reyes then produced a plastic sachet of suspected methamphetamine hydrochloride. The officers arrested both women and brought them to the police station.

At the station, the poseur-buyer placed the seized sachet in another plastic, sealed it, and marked it "DT-AR-JS." An inventory was prepared, but only a barangay official signed it. No representative from the media or the Department of Justice was present. The officers did not explain their absence. Both accused were convicted by the trial court and the Court of Appeals, and sentenced to life imprisonment and a fine of P500,000 each.

The Issue

The core question was whether the prosecution had established an unbroken chain of custody over the seized drugs, as required by Section 21 of RA 9165.

The Ruling

The Supreme Court reversed the conviction and acquitted Santa Maria. The Court held that while buy-bust operations are legitimate, the prosecution still bears the burden of proving every element of the offense—including the identity of the illegal drug.

To convict for illegal sale of dangerous drugs under Section 5, Article II of RA 9165, the prosecution must prove: (1) the identity of the buyer and seller, the object of the sale, and its consideration; and (2) the delivery of the thing sold and the payment therefor. Crucially, the drug itself is the corpus delicti—the body of the crime—and must be produced in court and shown to be the very same substance seized from the accused.

The Chain of Custody Rule

Section 21(1) of RA 9165 requires the apprehending team to physically inventory and photograph the seized drugs immediately after seizure, in the presence of:

• the accused or his representative or counsel;
• a representative from the media;
• a representative from the Department of Justice; and
• any elected public official.

These witnesses must sign the inventory and receive a copy. The law was later amended by RA 10640, which relaxed the witness requirements, but the original rule applied to this case because the crime was committed in 2006.

The Court acknowledged that strict compliance is not always possible under field conditions. However, for the saving clause to apply, the prosecution must prove two things: (a) there was a justifiable ground for non-compliance, and (b) the integrity and evidentiary value of the seized items were properly preserved. The justifiable ground must be proven as a fact—the Court cannot presume it exists.

Why the Conviction Failed

In this case, the Court of Appeals itself admitted that the inventory was signed only by a barangay official, and the marking, inventory, and photographing were done without counsel. The only explanation offered by the police was that the accused had no counsel at the time.

The Supreme Court found this insufficient. There was no showing that media or DOJ representatives were unavailable, or that the urgency of the operation prevented compliance. The prosecution failed to explain the deviations, and no justifiable ground was established.

The Court also noted that stricter adherence to Section 21 is required when the quantity of drugs seized is minuscule—here, only 0.02 grams—because such evidence is highly susceptible to planting, tampering, or alteration.

Practical Takeaways

• Compliance is mandatory, not optional. Police must observe Section 21 of RA 9165 and document their compliance. The presence of required witnesses is essential.
• Deviations must be explained. If the police cannot strictly comply, they must prove a justifiable ground as a fact—not merely assert one. The explanation should be in their sworn affidavit, with a statement on how the evidence's integrity was preserved.
• The prosecution bears the burden. It must acknowledge and justify any procedural lapses during trial. Silence or a bare excuse will not suffice.
• Small quantities invite stricter scrutiny. Courts are more demanding where the amount seized is tiny, because the risk of planting or tampering is greater.
• For accused persons and their counsel, scrutinize the chain of custody. Gaps in the procedure—unexplained absences of witnesses, missing documentation, or unclear handling—can be the basis for acquittal.

The case underscores that the chain of custody rule protects the innocent. When the State fails to prove the identity of the seized drug beyond reasonable doubt, the accused must be acquitted—even if the police operation appears successful on its face.

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