Illegal Drug Cases: Why Chain of Custody Failures Lead to Acquittal

The Supreme Court’s 2016 decision in People v. Ameril (G.R. No. 203293) is a powerful reminder that in criminal cases, especially those involving illegal drugs, the prosecution must do more than simply present evidence. It must prove that the evidence presented in court is exactly the same item seized from the accused, and that it was handled according to strict legal procedures. When police officers fail to follow these rules, even a seemingly strong case can collapse.

This article explains the Court’s ruling, the rules on chain of custody, and what this means for anyone facing or involved in a drug-related case.

The Facts of the Case

On May 24, 2005, police received a tip that Mardan Ameril was selling shabu. A buy-bust team was formed, and a poseur-buyer was sent to Ameril’s lodging house. The poseur-buyer showed boodle money, Ameril handed over three packs of shabu, and the police arrested him. The seized packets were marked "BB-MA-1" to "BB-MA-3" and later tested positive for methamphetamine hydrochloride.

Ameril was convicted by the Regional Trial Court and the Court of Appeals. But the Supreme Court reversed the conviction and acquitted him.

The Issue: Was the Evidence Properly Preserved?

The central question was whether the prosecution had proven beyond reasonable doubt that the drugs presented in court were the same drugs seized from Ameril. This is known as establishing the corpus delicti — the body of the crime. In drug cases, the dangerous drug itself is the corpus delicti, and its identity and integrity must be preserved from seizure to presentation in court.

The Court found serious flaws in how the police handled the evidence.

The Ruling: Chain of Custody Violations Are Fatal

The Court identified two major problems.

First, conflicting testimonies on marking. Marking is the starting point of the chain of custody. It means placing initials or a signature on the seized item immediately after seizure. In this case, one police officer testified that the investigator marked the sachets, while another testified that he himself made the markings. The prosecution never reconciled these conflicting statements. The Court ruled that this inconsistency cast doubt on the identity and integrity of the evidence.

Second, failure to comply with Section 21 of R.A. 9165. This law requires that, immediately after seizure, the apprehending team must conduct a physical inventory and take photographs of the seized drugs in the presence of the accused (or his representative), a media representative, a DOJ representative, and an elected public official. In this case, no inventory was made, no photos were taken, and the prosecution offered no explanation for these omissions.

The Court also noted that the prosecution presented no evidence on when and where the marking was done, or whether it was done in Ameril’s presence.

The Presumption of Regularity Cannot Save the Prosecution

The lower courts relied on the presumption that police officers regularly performed their duties. The Supreme Court disagreed. When there are unexplained irregularities — such as failure to mark immediately, failure to inventory, and failure to photograph — this presumption is rebutted. The Court emphasized that the presumption of regularity cannot defeat the constitutional presumption of innocence.

Practical Takeaways

• Chain of custody is critical. The prosecution must prove that the drugs seized are the same drugs presented in court. Any break in the chain can lead to acquittal.
• Marking must be immediate and in the accused’s presence. Marking is the first link in the chain. Delays or doubts about who did the marking are fatal.
• Comply with Section 21 of R.A. 9165. Inventory and photography are mandatory. If not complied with, the prosecution must explain why.
• Conflicting police testimonies weaken the case. Inconsistencies on material points, like who marked the evidence, discredit the prosecution.
• Presumption of regularity is not absolute. It cannot override the presumption of innocence when there are unexplained procedural lapses.

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