Chain of Custody in Drug Cases: Why Missing Witnesses Can Lead to Acquittal

In a significant ruling on drug cases, the Supreme Court acquitted an accused despite the prosecution's claim that he was caught selling and possessing shabu during a buy-bust operation. The acquittal in People v. Mendoza (G.R. No. 225061, October 10, 2018) underscores a strict rule: police must follow the chain of custody requirements under Section 21 of Republic Act No. 9165, or risk the case failing.

The case illustrates that even when evidence appears strong, technical compliance with the law's procedural safeguards can determine the outcome. For those facing drug charges, and for law enforcement, the ruling serves as a clear reminder of what the law demands.

The Facts of the Case

On April 4, 2013, police conducted a buy-bust operation against Jomar Mendoza in Pangasinan. A poseur-buyer purchased a sachet of shabu for P300, and a subsequent search yielded another sachet. The police marked the items, prepared a confiscation receipt in the presence of a barangay kagawad, and later brought the drugs to the crime laboratory, which confirmed they contained methamphetamine hydrochloride.

Mendoza was charged with illegal sale and illegal possession of dangerous drugs under Sections 5 and 11 of RA 9165. The Regional Trial Court convicted him, and the Court of Appeals affirmed. The defense claimed illegal arrest and frame-up, but the lower courts gave weight to the prosecution's version.

The Issue

The central question was whether Mendoza was guilty beyond reasonable doubt of the offenses charged. The Supreme Court, however, focused on a procedural matter: whether the prosecution had complied with the chain of custody rule under Section 21 of RA 9165.

The Chain of Custody Rule

Section 21 of RA 9165, as amended by RA 10640, requires that after seizure, the apprehending team must immediately conduct a physical inventory and photograph the seized drugs in the presence of three witnesses: the accused or his representative or counsel, an elected public official, and a representative of the National Prosecution Service or the media. These witnesses must sign the inventory and receive copies.

The Supreme Court has repeatedly emphasized that the presence of these witnesses is mandatory. They serve to guard against the unlawful planting of evidence and frame-ups. The prosecution bears the burden of proving compliance with this procedure.

Why the Conviction Was Reversed

In this case, the prosecution failed to prove compliance. No representative from the National Prosecution Service or the media was present during the physical inventory, and no such representative signed the inventory receipt. The arresting officer also admitted that no photograph was taken of the seized drugs at the place of arrest.

When asked why no media representative was present, the officer said the operation was kept secret to avoid divulging it publicly. The Court rejected this justification. The confidential nature of a buy-bust operation is not a valid reason to exclude required witnesses. The law requires their presence during the inventory, which happens after the arrest—at which point secrecy is no longer a concern.

Furthermore, the arresting officer's affidavit contained no explanation for the absence of the required witnesses, nor any statement of steps taken to preserve the integrity of the seized items. Under the rules, any justification for noncompliance must be clearly stated in the sworn statements of the apprehending officers.

Practical Takeaways

• The three-witness rule is strict. Police must secure an elected public official and a representative from the National Prosecution Service or media during the physical inventory and photographing of seized drugs.
• Secrecy is not an excuse. The confidential nature of a buy-bust operation does not justify excluding required witnesses from the post-arrest inventory.
• Documentation matters. Any failure to comply with Section 21 must be explained in the officers' sworn affidavits, along with the steps taken to preserve the evidence's integrity.
• For the accused, procedural lapses can lead to acquittal. If the prosecution fails to prove compliance with the chain of custody rule, the accused may be acquitted on reasonable doubt.
• For law enforcement, training is essential. Officers must know the requirements of Section 21 and the guidelines set by the Supreme Court to avoid the reversal of otherwise valid arrests.

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