Chain of Custody in Drug Cases: Lessons from a Landmark Philippine Supreme Court Ruling

In drug offense cases, the seized substance is the very heart of the prosecution's case. If its identity is compromised, the case collapses. In People v. Alon-Alon (G.R. No. 237803, November 27, 2019), the Supreme Court acquitted an accused because the police failed to follow the chain of custody rule under Section 21 of Republic Act No. 9165. This ruling is a clear reminder that procedural lapses can lead to an acquittal, no matter how strong the evidence may seem.

The Case: A Buy-Bust Operation Gone Wrong

The accused was charged with illegal sale of shabu under Section 5, Article II of RA 9165. Police conducted a buy-bust operation, and the accused allegedly sold a small plastic sachet of shabu (0.02 gram) to a poseur-buyer for P300. The arresting team marked the sachet and the buy-bust money at the scene, but the inventory and photographs were taken later at the police station, with only the accused and a media representative present. The trial court convicted him, and the Court of Appeals affirmed. The Supreme Court reversed the conviction.

The Issue: Was the Chain of Custody Broken?

The sole issue was whether the accused was guilty beyond reasonable doubt of illegal sale of dangerous drugs. The Court ruled he was not, because the prosecution failed to establish an unbroken chain of custody over the seized item.

The Four Links of the Chain

The Court enumerated four links the prosecution must prove:

1. Seizure and marking of the illegal drug by the apprehending officer.
2. Turnover of the seized drug from the apprehending officer to the investigating officer.
3. Turnover by the investigating officer to the forensic chemist for laboratory examination.
4. Turnover and submission of the marked drug from the forensic chemist to the court.

Each link requires testimony describing how the evidence was received, its condition, and the precautions taken to preserve its integrity.

The Lapses That Led to Acquittal

In this case, the Court found breaches in every link:

• First link: The physical inventory and photographs were not done at the place of arrest. More importantly, the required witnesses — a representative from the Department of Justice and an elected public official — were absent. Only a media representative was present.
• Second and third links: The seized item was turned over to one of the arresting officers, not the investigating officer. This officer brought it to the crime laboratory, but there was no testimony on how he handled the specimen while it was in his custody.
• Fourth link: The forensic chemist received the specimen from a receiving clerk and later retrieved it from the evidence custodian. However, the evidence custodian was not presented in court to testify, breaking the final link.

The Saving Clause Cannot Be Presumed

Section 21 of RA 9165 has a saving clause: non-compliance will not invalidate the seizure if there are justifiable grounds and the integrity of the evidence is preserved. However, the Court stressed that this clause applies only when the prosecution acknowledges the procedural lapses and cites justifiable grounds proven as facts. Courts cannot presume what these grounds are or whether they even exist.

In this case, the prosecution failed to even acknowledge the deficiencies, much less provide justification. The Court also noted that because the seized shabu was only 0.02 gram, the need for exacting compliance was even greater, citing People v. Holgado (G.R. No. 207992, August 11, 2014). Small, fungible items are more susceptible to tampering or loss.

Practical Takeaways

• Strict compliance matters: Police must follow Section 21 of RA 9165 to the letter — inventory and photograph the seized items immediately at the place of arrest, in the presence of the accused, a media representative, a DOJ representative, and an elected public official.
• Every link must testify: The prosecution must present testimony for each link in the chain, including the evidence custodian, to prove the drug's integrity from seizure to court presentation.
• Acknowledge lapses: If there is non-compliance, the prosecution must admit it and prove justifiable grounds. Silence is fatal.
• Small amounts demand stricter compliance: The smaller the seized substance, the greater the risk of tampering, and the more exacting the Court's scrutiny.
• For the accused: A broken chain of custody can create reasonable doubt, leading to acquittal even if the sale appears to have occurred.

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