Chain of Custody in Drug Cases: When Police Lapses Lead to Acquittal

In a significant ruling on drug evidence handling, the Supreme Court acquitted Dioscoro Comoso y Turemutsa of illegal sale of marijuana, emphasizing that failure to comply with chain of custody requirements under Republic Act No. 9165 warrants acquittal. The case illustrates how procedural lapses by law enforcement can undermine the prosecution's case, even when the accused is caught in a buy-bust operation.

The Facts of the Case

On March 26, 2005, police officers conducted a buy-bust operation in Puerto Princesa City after receiving information that a certain "Coro" was selling illegal drugs. The operation involved a civilian asset who acted as the poseur-buyer. When the transaction was consummated, the asset removed his hat as the pre-arranged signal.

Police Officer 2 Ferdinand Aquino recovered the plastic sachet of marijuana from the asset and marked it with his initials "FJA." The buy-bust money, a used marijuana stick, and a lighter were also recovered from the accused. However, the forensic chemist only received the seized items on April 8, 2005—about two weeks after the operation.

The Issue Before the Court

The central question was whether the prosecution proved Comoso's guilt beyond reasonable doubt despite not strictly complying with the requirements for preserving the integrity and evidentiary value of the seized drugs.

The Ruling: Acquittal for Procedural Lapses

The Supreme Court reversed the convictions of both the Regional Trial Court and the Court of Appeals, acquitting Comoso. The Court identified several critical gaps in the chain of custody:

Unclear Marking and Inventory Procedures. The arresting officer's testimony did not clarify whether the inventory was conducted in the accused's presence, whether the accused signed it, or whether the items were turned over to an investigating officer. The Court noted the arresting officer merely testified that he marked the sachet with his initials and brought it to the crime laboratory.

Unjustified Delay in Turnover. The seized items were received by the forensic chemist on April 8, 2005—10 working days after the buy-bust operation. This exceeded the 24-hour period required by law, and the prosecution offered no explanation for the delay. The Court held this created reasonable doubt on whether the drug tested was the same drug seized from the accused.

Missing Witnesses to the Inventory. The records showed no evidence that an elected public official and a representative of the National Prosecution Service or the media were present during the inventory, as required by Section 21 of RA 9165. The prosecution did not justify this noncompliance.

Presumption of Regularity Cannot Apply

The Court rejected the prosecution's reliance on the presumption of regularity in the performance of official duties. Citing People v. Kamad, the Court explained that this presumption only applies when nothing in the record suggests that law enforcers deviated from standard procedures. When the official act is irregular on its face, the presumption cannot arise.

The Court emphasized that to excuse noncompliance, the prosecution must prove two things: (1) justifiable grounds for the noncompliance, and (2) that the integrity and evidentiary value of the seized items were properly preserved despite the lapse.

Why Strict Compliance Matters

The Court underscored that narcotics are not readily identifiable and require scientific analysis. Their physical similarity to everyday objects makes them susceptible to adulteration, substitution, and planting. As cited in Mallillin v. People, a more stringent standard must be applied to drug evidence than to objects that are readily identifiable.

The Court also cited People v. Lim, which established a mandatory policy requiring apprehending officers to state their compliance with Section 21 requirements in their sworn statements, and to explain any non-observance. If no justification is given, the investigating fiscal must not immediately file the case.

Practical Takeaways

• Chain of custody is the backbone of drug prosecutions. Every link—from seizure and marking to turnover to the investigating officer, to submission to the forensic chemist, and finally to presentation in court—must be clearly established.

• Timing matters. Seized drugs must be submitted to the forensic laboratory within 24 hours of confiscation. Unexplained delays create reasonable doubt about the identity and integrity of the evidence.

• Documentation is critical. The inventory must be conducted in the presence of the accused or their representative, an elected public official, and a representative of the National Prosecution Service or media, who must sign the inventory.

• The presumption of regularity is not a shield. Police officers cannot hide procedural lapses behind the presumption of regularity in official duty. If the record shows deviations from required procedures, the presumption does not apply.

• For defense counsel, scrutinize the prosecution's compliance with Section 21. Gaps in the chain of custody can be the strongest ground for acquittal, even when the accused was caught in flagrante.

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