Buy-Bust Operations and the Chain of Custody Rule Under RA 9165

In a significant ruling on the strict requirements of anti-drug prosecutions, the Supreme Court acquitted an accused charged with illegal sale of shabu after finding that the prosecution failed to establish the chain of custody and failed to present the poseur-buyer. The case of People v. Saragena (G.R. No. 210677, August 23, 2017) underscores that when the quantity of the seized substance is miniscule, the requirements of Section 21 of Republic Act No. 9165 (Comprehensive Dangerous Drugs Act of 2002) must be strictly complied with.

The Facts of the Case

On June 23, 2005, a buy-bust team in Cebu City allegedly purchased 0.03 grams of shabu from Abundio Saragena, also known as "Tatay." The team was composed of SPO3 Magdadaro as team leader, PO1 Misa as poseur-buyer, and SPO1 Paller as back-up. The transaction allegedly took place at around 7:00 p.m., with the two back-up officers positioned five to eight meters away.

The seized plastic pack was marked only at the police station, not at the scene of arrest. No physical inventory was conducted, no photographs were taken, and no required witnesses—such as an elected public official or a media representative—were present. The poseur-buyer, PO1 Misa, was never presented in court.

The Issue

The central question was whether the accused was guilty beyond reasonable doubt of violating Section 5 of RA 9165, and whether the police officers substantially complied with the chain of custody rule.

The Ruling

The Supreme Court reversed the conviction and acquitted Saragena. The Court held that the prosecution failed to overcome the constitutional presumption of innocence.

Failure to present the poseur-buyer. The Court noted that PO1 Misa, the only person who could directly attest to the transaction, was not presented in court. Given that the two back-up officers were five to eight meters away, it was nighttime, and the alleged drug weighed only 0.03 grams—approximately the weight of a grain of rice—the Court found it improbable that they clearly witnessed the exchange.

Defective chain of custody. The Court enumerated several fatal lapses:

• The seized item was marked at the police station, not immediately at the place of seizure
• The marking was not done in the presence of the accused
• No physical inventory or photographs were taken
• The required witnesses (elected official, media or DOJ representative) were absent
• PO2 Roma, who received the specimen at the crime laboratory, was not presented in court

Strict compliance required. Citing Mallillin v. People, the Court emphasized that a more stringent standard applies to narcotic substances because they are not readily identifiable and are susceptible to tampering, alteration, or substitution. The Court rejected the Court of Appeals' application of the exception to the chain of custody rule, noting that the prosecution must provide "justifiable grounds" for noncompliance—not merely assert that the integrity of the evidence was preserved.

Practical Takeaways

• Mark immediately. Seized drugs must be marked at the place of seizure, if practicable, and in the presence of the accused. Delaying marking until arrival at the police station creates doubt about the integrity of the evidence.
• Secure required witnesses. For warrantless seizures, the physical inventory and photographing must be done in the presence of the accused (or representative/counsel), an elected public official, and a representative from the media or the National Prosecution Service. In a planned buy-bust operation, securing these witnesses is not impossible.
• Present all links in the chain. Every person who handled the seized item—from the poseur-buyer to the forensic chemist—should be presented in court. Gaps in the chain, such as failing to present a receiving officer at the crime laboratory, are fatal.
• Document justifiable grounds. If there is noncompliance with Section 21, the apprehending officers must clearly state the justifiable grounds in their sworn affidavits, along with the steps taken to preserve the integrity of the seized items.
• Miniscule amounts demand stricter scrutiny. Courts are exhorted to be extra vigilant in drug cases involving very small quantities, as these are easily planted or tampered with.

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