Buy-Bust Operations and the Chain of Custody Rule: People v. Villahermoso

The Supreme Court’s 2018 Resolution in People v. Villahermoso (G.R. No. 218208) reaffirms two important principles in Philippine drug prosecutions: prior surveillance is not a prerequisite for a valid buy-bust operation, and substantial compliance with the Chain of Custody Rule can sustain a conviction if the integrity of the seized drugs is preserved. The ruling offers practical guidance for law enforcement and clarity for accused persons challenging the legality of their arrest.

Facts of the Case

On October 12, 2006, a buy-bust team in Cebu City was formed after information that Brian Villahermoso was selling shabu. A poseur-buyer, PO2 Joseph Villaester, was designated, and the operation was coordinated with the PDEA. The informant introduced the poseur-buyer to Villahermoso, who then handed over two sachets of shabu in exchange for boodle money wrapped in a genuine P1,000 bill. After the transaction, the poseur-buyer signaled the team, and Villahermoso was arrested and apprised of his constitutional rights.

The seized sachets were marked at the police station as "BV-01" and "BV-02," and a chemistry report confirmed they contained methamphetamine hydrochloride. Villahermoso denied the charge, claiming he was in the area to collect payment for mangoes and that the police fabricated the case against him.

The Issue

The central issue was whether the prosecution proved Villahermoso’s guilt beyond reasonable doubt, particularly given the alleged failure to conduct prior surveillance and the lapses in the chain of custody—specifically, the marking of the drugs at the police station rather than at the scene, and the absence of a physical inventory and photographs.

The Ruling

The Supreme Court dismissed the appeal and affirmed the conviction for violation of Section 5, Article II of Republic Act No. 9165, imposing life imprisonment and a fine of P500,000.00.

On prior surveillance, the Court cited People v. Abedin (685 Phil. 552 [2012]) in holding that prior surveillance is not required for a valid entrapment, especially when the buy-bust team is accompanied by an informant to the target area. In this case, the informant contacted the appellant and introduced the poseur-buyer, making the operation valid.

On the Chain of Custody Rule, the Court cited People v. Morate (725 Phil. 556 [2014]) and acknowledged that substantial compliance is sufficient as long as the integrity and evidentiary value of the seized items are preserved. The Court approved the CA’s reasoning that the arresting officers were justified in marking the sachets at the station because the appellant was struggling and resisting arrest. The absence of a physical inventory and photographs did not warrant acquittal because the prosecution established a clear chain: the sachets were marked, delivered to the crime laboratory the same day, and tested positive for shabu. There was no doubt that the items seized were the same items presented in court.

Practical Takeaways

• Prior surveillance is not mandatory. A buy-bust operation is valid even without prior surveillance, especially when an informant accompanies the team and facilitates the transaction.
• Substantial compliance with the Chain of Custody Rule can suffice. Minor deviations—such as marking at the station or the absence of inventory photos—will not automatically result in acquittal if the integrity of the seized drugs is preserved and the chain is unbroken.
• Document every step. The prosecution’s case was strengthened by clear testimony on the marking, delivery, and laboratory examination of the seized items. Police officers should still document each transfer to avoid unnecessary challenges.
• Resistance can justify procedural deviations. The Court considered the appellant’s struggle and resistance as a valid reason for marking the drugs at the station rather than at the scene.
• The burden remains on the prosecution. While substantial compliance is allowed, the prosecution must still prove beyond reasonable doubt that the drugs seized are the same drugs presented in evidence.

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