Chain of Custody in Drug Cases: Why Compliance With Section 21 Is Crucial

In a buy-bust operation, the seized drugs are the very heart of the case. If the police cannot prove that the substance presented in court is the same one taken from the accused, the prosecution fails. The Supreme Court, in People v. Señeres, Jr. (G.R. No. 231008, November 5, 2018), reversed a drug conviction because the police did not comply with the mandatory chain of custody requirements under Section 21 of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002. The case is a clear reminder that strict compliance with the rules on evidence preservation is not a mere technicality—it is a constitutional safeguard.

The Facts of the Case

In September 2011, police conducted a buy-bust operation at a mall in Taguig City against a certain "Dennis" who was allegedly selling illegal drugs. Dennis did not appear, but sent two substitutes: Federico Señeres, Jr. and Federico Valencia, Jr. The poseur-buyer bought a sachet of shabu from the two for P2,500. A second sachet was recovered from Valencia's pocket.

The police marked the seized sachets and conducted an inventory. However, the only witness to the inventory was a security guard of the mall. No representative from the media, the Department of Justice, or any elected public official was present. The police claimed they called the barangay, but no barangay official came, and they offered no documentary proof that they tried to secure the required witnesses.

Señeres was charged with illegal sale of drugs. He was convicted by the Regional Trial Court, and the Court of Appeals affirmed. On appeal, the Supreme Court reversed and acquitted him.

The Issue: Did the Police Properly Preserve the Evidence?

The central question was whether the prosecution had established an unbroken chain of custody over the seized drugs. Under Section 5, Article II of RA 9165, the illegal drug confiscated from the accused is the corpus delicti—the very body of the crime. The prosecution must prove with certainty that the substance bought during the buy-bust is exactly the same substance offered in evidence in court.

To ensure this, Section 21 of RA 9165 requires that, immediately after seizure, the apprehending team must physically inventory and photograph the drugs 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 Ruling: Non-Compliance Without Justification Is Fatal

The Supreme Court held that the police failed to comply with Section 21. Only a mall security guard witnessed the inventory. The police did not present any justifiable reason for the absence of the required witnesses, nor did they prove that they exerted earnest efforts to secure their presence.

The Court emphasized that non-compliance does not automatically invalidate a seizure. The saving clause in the law allows the case to proceed if the prosecution proves two things: (1) there was a justifiable ground for non-compliance, and (2) the integrity and evidentiary value of the seized items were preserved. But the prosecution must explain the reasons behind the procedural lapses—and must prove those reasons as facts. A mere statement that witnesses were unavailable, without showing serious attempts to find them, is a "flimsy excuse."

The Court also noted that the law requires a stricter adherence to Section 21 when the quantity of drugs seized is small, because such evidence is highly susceptible to planting, tampering, or alteration.

Practical Takeaways

• Compliance is mandatory, not optional. Police must strictly follow Section 21 of RA 9165. The presence of the required witnesses during inventory and photography is the rule.
• The saving clause has limits. Non-compliance can be excused only if the prosecution proves a justifiable ground and shows that the evidence's integrity was preserved. Both must be proven as facts.
• Earnest effort must be shown. Police must document their attempts to secure the required witnesses. A bare claim of unavailability is not enough.
• Document everything. The Court suggested that police officers should state their compliance—or their justification for non-compliance—in their sworn affidavits. This helps prosecutors and courts assess the case fairly.
• For the accused, this is a defense. If the police fail to comply with Section 21 and cannot justify it, the seized drugs may be deemed inadmissible, and the accused may be acquitted.

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