Chain of Custody in Drug Cases: Why Procedure Protects Your Rights

In a significant ruling, the Supreme Court acquitted Erlinda Capuno y Tison of illegal drug sale charges, emphasizing that law enforcers must strictly follow the chain of custody rule and other procedures under Republic Act No. 9165. The case highlights how procedural lapses can mean the difference between conviction and acquittal in drug cases.

The Facts of the Case

On July 21, 2002, police officers conducted a buy-bust operation against Capuno in Rodriguez, Rizal. A poseur-buyer allegedly purchased shabu from her using a marked one hundred peso bill. The police brought Capuno and the seized plastic sachet to the police station, then forwarded the item to the crime laboratory the next day.

The prosecution charged Capuno with illegal sale of dangerous drugs under Section 5, Article II of RA 9165. The trial court convicted her, and the Court of Appeals affirmed with a modified penalty of life imprisonment and a P500,000 fine.

The Issue: Was the Chain of Custody Broken?

The Supreme Court ruled that the prosecution failed to prove Capuno's guilt beyond reasonable doubt. The Court identified several critical procedural lapses in handling the seized evidence.

First, the apprehending team did not mark the confiscated plastic sachet immediately upon seizure. Marking is the starting point of the custodial link—it separates the seized evidence from all other similar items and prevents switching, planting, or contamination.

Second, the police failed to conduct a physical inventory and photograph the seized items in the presence of the accused or her counsel, a media representative, a DOJ representative, and an elected public official, as required by Section 21, Article II of RA 9165.

Third, the prosecution failed to identify who received the seized item at the police station. While a request for laboratory examination was prepared by the Chief of Police, the evidence did not show he actually received the sachet from the arresting officer.

Fourth, the specimen was forwarded to the crime laboratory only the next day by a certain PO1 Sanchez, but no one testified about the custody of the drug during the interim period.

The Saving Clause and Its Limits

The Implementing Rules of RA 9165 offer some flexibility: non-compliance with the required procedures may not invalidate seizures if there are justifiable grounds and the integrity of the evidence is preserved. However, this saving clause applies only when the prosecution acknowledges the procedural lapses, explains the justifiable grounds, and proves that the evidence's integrity was maintained.

In this case, the prosecution did not even attempt to offer any justification for its failure to follow the prescribed procedures.

The Presumption of Regularity Cannot Overcome Presumption of Innocence

The Court also rejected the lower courts' reliance on the presumption of regularity in the performance of official duties. This presumption is not conclusive and cannot, by itself, overcome the constitutional presumption of innocence. Where the official act is irregular on its face, an adverse presumption arises instead.

The Court further found that the testimonies of the police officers contained substantial inconsistencies—they gave conflicting accounts of how the informant reported the accused's illegal activities and where the buy-bust operation actually took place. These contradictions destroyed their credibility.

Practical Takeaways

• Marking is crucial: Seized drugs must be marked immediately upon confiscation. This is the first link in the chain of custody.
• Inventory and photography are mandatory: The apprehending team must conduct a physical inventory and take photographs in the presence of the accused, a media representative, a DOJ representative, and an elected public official.
• The prosecution must explain lapses: If procedures are not followed, the prosecution must acknowledge the lapse and prove justifiable grounds and preservation of evidence integrity.
• Presumption of regularity is rebuttable: Police officers cannot simply rely on the presumption of regular performance when their actions show clear deviations from the law.
• Every link must be accounted for: Every person who handles the seized evidence must testify on how they received it, what they did with it, and how they transferred it to the next person.

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