Chain of Custody in Drug Cases: How Improper Handling Leads to Acquittal

In drug cases, the prosecution must prove not only that the accused sold or possessed illegal drugs, but also that the very substance presented in court is the same one seized from the accused. This is the essence of the chain of custody rule. When police officers break this chain, the accused may walk free—even when the evidence appears strong.

In People v. Navarrete (G.R. No. 185211, June 6, 2011), the Supreme Court reversed a conviction for selling shabu because the arresting team failed to follow the mandatory procedure for handling seized drugs under Section 21 of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002.

The Facts of the Case

On March 12, 2005, police officers in Cebu City conducted a buy-bust operation against Arnel Bentacan Navarrete. A confidential informant, acting as poseur-buyer, handed a marked one hundred peso bill to Navarrete, who allegedly gave the informant a small plastic sachet containing white crystalline substance believed to be shabu.

The team arrested Navarrete and recovered the marked money. The sachet was turned over to SPO1 Selibio, who later claimed he marked it with the initials "ANB." The sachet was submitted to the PNP Crime Laboratory, which confirmed the substance was methylamphetamine hydrochloride, or shabu, weighing 0.05 gram.

The trial court convicted Navarrete and sentenced him to life imprisonment and a fine of P500,000. The Court of Appeals affirmed. Navarrete appealed to the Supreme Court.

The Issue

The central question was whether the prosecution had properly established the chain of custody of the seized drugs. Specifically, did the police comply with Section 21 of RA 9165, which requires that seized drugs be physically inventoried and photographed immediately after seizure, in the presence of the accused or his representative?

The Ruling: Acquittal for Broken Chain of Custody

The Supreme Court acquitted Navarrete. The Court found serious gaps in how the police handled the seized sachet.

First, the police did not conduct any physical inventory of the seized item, nor did they photograph it—both required by Section 21. The Court noted that the law admits exceptions to this rule, but only when there is a justifiable ground for non-compliance and the integrity of the evidence is preserved. In this case, the police offered no justification.

Second, the Court found serious doubts about the marking of the sachet. While SPO1 Selibio claimed at trial that he marked the sachet with "ANB," no other team member testified to seeing him do so. The prosecution also failed to establish when the marking was made. The Joint Affidavit executed by the team merely stated that the sachet was "later submitted for examination," without detailing who marked it or when.

The Court stressed that the failure to mark the seized item immediately after seizure raises doubts about whether the substance submitted to the crime laboratory was actually the same one recovered from the accused. Without a reliable chain of custody, the prosecution cannot prove the identity of the corpus delicti—the body of the crime.

Why This Matters

The Court reiterated that anti-narcotics operations are prone to abuse. The use of informants, the secrecy of drug deals, and the ease with which drugs can be planted all demand extra vigilance from the courts. The presumption of regularity in the performance of official duties cannot stand when the police fail to show that the evidence was properly preserved.

As the Court put it, imposing a conviction on such "shoddy police work, absent exempting circumstances, would only spawn further abuses."

Practical Takeaways

• Mark seized items immediately. The apprehending officer should mark the confiscated drugs at the scene or as soon as practicable, in the presence of the accused if possible. Delayed or unexplained marking creates reasonable doubt.

• Comply with Section 21, RA 9165. The police must physically inventory and photograph seized drugs immediately after seizure, in the presence of the accused or his representative, who should sign the inventory and receive a copy.

• Document every transfer. Every person who handles the seized item—from the arresting officer to the forensic chemist—should be able to testify to its custody. Gaps in this chain can be fatal to the prosecution.

• Justify any deviation. If compliance with Section 21 is impossible, the police must explain why. Unjustified non-compliance negates the presumption of regularity and may lead to acquittal.

• For the defense, scrutinize the chain. In drug cases, the defense should focus not only on the accused's denial or frame-up claim, but also on whether the prosecution proved the identity of the seized drugs beyond reasonable doubt.

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