Chain of Custody and the Presumption of Innocence in Philippine Drug Cases

The Supreme Court has repeatedly stressed that in drug cases, the identity of the seized drugs must be established beyond reasonable doubt. This means the prosecution must prove that the drugs presented in court are the very same items seized from the accused. When police officers fail to follow the chain of custody rules under Republic Act No. 9165, the accused may be acquitted—even if the defense is weak.

In People v. Mendoza y Estrada (G.R. No. 192432, June 23, 2014), the Court reversed the conviction of a man charged with selling and possessing shabu. The ruling is a clear reminder that the presumption of regularity in police work cannot override the constitutional presumption of innocence.

The Facts of the Case

On August 28, 2007, police officers in Binangonan, Rizal conducted a buy-bust operation against alias "Larry." A poseur buyer purchased two plastic sachets of shabu for P500. After the arrest, police frisked the accused and recovered a third sachet. The items were marked "LEM-1," "LEM-2," and "LEM-3" and later tested positive for methamphetamine hydrochloride.

The accused denied the charges and claimed he was framed. He said police cuffed him, showed him sachets with his initials, and asked for protection money. The trial court convicted him of violating Sections 5 and 11 of RA 9165. The Court of Appeals affirmed, relying heavily on the credibility of the police officers and the presumption of regularity in their duties.

The Issue

The sole issue was whether the prosecution proved the accused's guilt beyond reasonable doubt. The accused argued that the police failed to comply with Section 21 of RA 9165 on the chain of custody of seized drugs.

The Ruling: Acquittal for Broken Chain of Custody

The Supreme Court acquitted the accused. The Court found several serious lapses in how the police handled the seized drugs.

First, no representative from the media, the Department of Justice, or any elected public official was present during the seizure, inventory, or photographing of the drugs. This insulating presence is required by Section 21(1) of RA 9165 to prevent switching, planting, or contamination of evidence.

Second, the prosecution never presented any physical inventory of the seized items. The formal offer of evidence did not include an inventory, which cast doubt on whether any shabu was really taken from the accused.

Third, the police took photographs of the items only at the police station, not at the place of seizure. The prosecution offered no explanation for this delay.

The Court noted that the buy-bust team had about 48 days to prepare—there had been a test buy on July 10, 2007—yet still failed to follow the required procedure. The saving clause in the IRR of RA 9165 allows non-compliance only if the prosecution acknowledges the lapse and credibly explains it. Here, the prosecution did neither.

The Presumption of Regularity Cannot Beat the Presumption of Innocence

The Court also corrected the lower courts' reliance on the presumption of regularity in the performance of official duty. That presumption is rebuttable. When the records show hints of irregularity—as they did here—the presumption cannot stand.

More importantly, the presumption of regularity is a mere rule of evidence. It cannot defeat the constitutionally protected right to be presumed innocent. As the Court warned, trial courts must not let a rule of evidence subordinate a constitutional guarantee.

Practical Takeaways

• Chain of custody is not a technicality. It protects the accused from planted or switched evidence. A broken chain can mean acquittal.
• Police must follow Section 21 of RA 9165. The physical inventory and photographing must be done immediately after seizure, in the presence of the accused or counsel, a media representative, a DOJ representative, and an elected public official.
• The saving clause has limits. Non-compliance is excused only when the prosecution admits the lapse and gives a credible justification. Silence is not enough.
• The presumption of regularity is weak. It applies only when there is no hint of irregularity. It can never outweigh the presumption of innocence.
• For the accused, a weak defense is not fatal. The prosecution must stand on its own evidence. If it fails to prove guilt beyond reasonable doubt, the accused must be acquitted.

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