Chain of Custody in Drug Cases: Preserving Evidence Integrity Under RA 9165

The Supreme Court’s 2015 ruling in People v. Basilio reaffirms a crucial principle in Philippine drug prosecutions: what matters most is not rigid compliance with every procedural step, but whether the integrity and evidentiary value of the seized drugs were preserved. For anyone facing or studying drug charges, this case clarifies how courts weigh lapses in the chain of custody.

The Case: A Buy-Bust Operation in Manila

On November 2, 2006, police officers conducted a buy-bust operation against a certain "Kagi" in San Gabriel, Old Sta. Mesa, Manila. SPO1 Federico Chua acted as the poseur-buyer, approaching the suspect with a P100 bill. The suspect, later identified as Larry Basilio, handed over a small plastic sachet of white crystalline substance in exchange for the marked money.

After the arrest, SPO1 Chua brought Basilio and the seized item to the police station. There, he marked the sachet with "LBH"—Basilio's initials—and turned it over to the investigator. The item was then delivered to the Manila Police District Crime Laboratory, where Forensic Chemical Officer PSI Elisa Reyes tested it. The substance weighed 0.083 gram and tested positive for methylamphetamine hydrochloride, or shabu.

The Issue on Appeal

Basilio was convicted of illegal sale of dangerous drugs under Section 5, Article II of Republic Act No. 9165 and sentenced to life imprisonment with a P500,000 fine. On appeal, he argued that the police violated Section 21 of RA 9165 by failing to conduct an inventory of the seized item and to photograph it. He also questioned why the marking was done at the police station rather than at the place of arrest.

The Court's Ruling: Substance Over Form

The Supreme Court affirmed the conviction. To prove illegal sale of drugs, the prosecution must establish: (1) the identity of the buyer and seller, the object of the sale, and the consideration; and (2) the delivery of the thing sold and its payment. The Court found all these elements present—the witnesses positively identified Basilio as the seller, and the substance presented in court was the same item sold and delivered.

On the chain of custody, the Court explained that the requirement aims to ensure the seized item's integrity and evidentiary value are preserved. Here, the chain was unbroken: SPO1 Chua held the sachet after arrest, marked it "LBH" at the station, PO3 Jimenez delivered it to the crime laboratory, and PSI Reyes confirmed the same marking tested positive for shabu.

Marking at the Police Station Is Acceptable

The Court rejected Basilio's argument that marking should have been done immediately at the place of seizure. While RA 9165 provides for immediate marking, it does not specify a time frame or location. Citing People v. Resurreccion, the Court ruled that marking upon immediate confiscation contemplates even marking at the nearest police station or office of the apprehending team.

Missing Inventory and Photos: A Minor Lapse

The prosecution admitted that the police failed to conduct an inventory and to photograph the seized item, as required by Section 21 of RA 9165 and its Implementing Rules and Regulations. Despite this, the Court held that the non-compliance did not affect the item's evidentiary weight. Because the chain of custody was unbroken, the integrity of the evidence was not compromised. The Court stressed that what is of utmost importance is the preservation of the integrity and evidentiary value of the seized item.

Practical Takeaways

• The chain of custody is about preserving the identity and integrity of the seized drug from seizure to court presentation—not about perfect compliance with every procedural detail.
• Marking the seized item at the police station, rather than at the place of arrest, is acceptable under the law.
• Missing inventory and photographs do not automatically render a seized drug inadmissible if the chain of custody remains unbroken.
• Prosecutors must still present clear testimony or records showing the continuous whereabouts of the evidence.
• For the defense, attacking the chain of custody requires showing actual doubt about the evidence's identity, not just technical lapses.

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