When Police Break the Chain of Custody: Acquittal in Drug Possession Cases

In a significant ruling on the proper handling of seized illegal drugs, the Supreme Court acquitted two men convicted of possessing shabu because the prosecution failed to prove an unbroken chain of custody. The case of Zafra v. People (G.R. No. 190749, April 25, 2012) serves as a clear reminder that in drug cases, the prosecution must do more than rely on the presumed regularity of police work—it must prove every link in the chain of custody with unwavering exactitude.

The Facts of the Case

On June 12, 2003, SPO4 Apolinario Mendoza, the lone police officer conducting surveillance in Balagtas, Bulacan, claimed to have seen Valentin Zafra and Eroll Marcelino holding shabu while a companion, Marlon Daluz, held an aluminum foil and lighter. The officer single-handedly apprehended the three, confiscated the drugs, and brought them to the police station. He personally marked the sachets, kept custody of them, and later brought them to the crime laboratory for testing.

Zafra and Marcelino were charged with illegal possession of dangerous drugs under Section 11, Article II of Republic Act No. 9165 (the Comprehensive Dangerous Drugs Act of 2002). Both the Regional Trial Court and the Court of Appeals convicted them, relying heavily on the officer's testimony and the presumption of regularity in the performance of official duties.

The Fatal Inconsistencies

The Supreme Court found that the arresting officer's credibility was seriously undermined by material inconsistencies in his account. In his sworn affidavit, the officer stated he saw Zafra handing a sachet of shabu to Marcelino. During direct examination, however, he testified that he saw both men holding shabu from a distance. On cross-examination, he gave yet another version—pointing to Daluz as the one holding shabu and Zafra as the one with drug paraphernalia.

These were not minor discrepancies. The Court noted that possession of drug paraphernalia and possession of shabu are two different offenses under RA 9165. The confusion over who held what was material to the accusation and the defense.

The Broken Chain of Custody

The Court emphasized that the dangerous drug itself constitutes the corpus delicti of the offense. Its identity must be established beyond doubt—the substance seized must be the very same substance offered in court. The chain of custody rule ensures this by requiring testimony about every link, from seizure to presentation in court.

Section 21 of RA 9165 requires that after seizure, the apprehending team must physically inventory and photograph the drugs in the presence of the accused or their representative, a media representative, a DOJ representative, and an elected public official. The officer in this case did none of this. There was no inventory, no photographs, no witnesses. He was the lone arresting officer, the one who marked the evidence, the one who kept custody, and the one who brought the items to the laboratory.

The Court noted that while non-compliance with procedural requirements does not automatically invalidate a seizure, the prosecution must show a justifiable ground for the non-compliance and prove that the integrity of the evidence was preserved. Here, the prosecution offered no justification at all.

Presumption of Regularity Cannot Overcome Presumption of Innocence

Perhaps the most important principle reaffirmed in this case is that the presumption of regularity in the performance of official functions cannot, by itself, overcome the constitutional presumption of innocence. Evidence of guilt beyond reasonable doubt—and nothing less—is required to convict.

The Court cited a string of similar cases where convictions were reversed for failure to inventory and photograph seized drugs, including People v. Salonga, People v. Gutierrez, and People v. Cantalejo.

Practical Takeaways

• Chain of custody is non-negotiable. Police must strictly follow Section 21 of RA 9165: inventory and photograph seized drugs in the presence of the accused, a media representative, a DOJ representative, and an elected official.
• Inconsistencies matter. Material contradictions in a witness's testimony—especially the lone prosecution witness—can destroy credibility and warrant acquittal.
• Presumption of regularity is not a substitute for proof. The prosecution cannot rely on the presumed regularity of police conduct to overcome the presumption of innocence.
• Non-compliance requires explanation. If procedural requirements are not followed, the prosecution must prove a justifiable ground and show that the integrity of the evidence was preserved.
• For the accused, the right to acquittal is real. When moral certainty of guilt hangs in the balance, the principle of in dubio pro reo—when in doubt, rule for the accused—applies.

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