Chain of Custody Safeguarding Drug Evidence and Ensuring Fair Trials in the Philippines

The integrity of evidence is the bedrock of every criminal conviction. In drug cases, where the illegal substance itself is the corpus delicti, the prosecution must prove beyond doubt that the item seized is the same item presented in court. In People v. Lacdan (G.R. No. 232161, August 14, 2019), the Supreme Court reversed a conviction for illegal sale of drugs because the police failed to observe the chain of custody rule. The ruling serves as a reminder that procedural lapses, no matter how small, can determine the fate of the accused.

The Facts of the Case

On March 3, 2013, police officers in San Pedro, Laguna conducted a buy-bust operation against Shager Lacdan. PO2 Alexander Gallega acted as poseur buyer and purchased one plastic sachet of suspected shabu for P200.00. After the sale, the team arrested Lacdan, marked the sachet with "SL-B," and brought him to the police station.

At the station, the officers conducted a physical inventory and took photographs. Only a media representative was present. No representative from the Department of Justice (DOJ) or any elected public official attended the inventory. The seized item was later brought to the crime laboratory, where Forensic Chemist Donna Villa Huelgas confirmed it contained methamphetamine hydrochloride.

The trial court convicted Lacdan and sentenced him to life imprisonment and a fine of P500,000.00. The Court of Appeals affirmed the conviction, prompting Lacdan to appeal to the Supreme Court.

The Issue

The central question was whether the prosecution had established an unbroken chain of custody over the seized drugs, as required by Section 21 of Republic Act 9165 (the Comprehensive Dangerous Drugs Act of 2002).

The Ruling: Acquittal for Broken Links

The Supreme Court acquitted Lacdan. The Court identified multiple breaches in the chain of custody, each casting doubt on the identity and integrity of the seized item.

First link: Seizure, marking, and inventory. The law requires that the physical inventory and photograph of seized drugs be done in the presence of the accused, a media representative, a DOJ representative, and an elected public official. In this case, only the media representative was present. The arresting officers did not explain the absence of the other required witnesses.

Second link: Turnover to the investigating officer. No prosecution witness testified about the turnover of the seized sachet to an investigating officer at the police station. The prosecution did not establish this crucial transfer.

Third link: Turnover to the forensic chemist. PO2 Gallega handed the sachet to a receiving clerk at the crime laboratory, but the clerk was never named or presented in court. The Court noted the lack of proof on how the drug was handled from receipt by the clerk until it reached the forensic chemist.

Fourth link: Submission to court. While the forensic chemist claimed she returned the item to an evidence custodian and later retrieved it for presentation in court, there was no showing of how the custodian stored and handled the item in the interim.

The Court cited Mallillin v. People (576 Phil. 576 [2008]), which requires testimony about every link in the chain—each person who touched the exhibit must describe how and from whom it was received, and what happened to it while in their possession.

The Importance of Strict Compliance

The Court emphasized that the chain of custody rule exists because illegal drugs are indistinct, not readily identifiable, and easily tampered with. The prosecution cannot rely on the presumption of regularity in the performance of official duties when the evidence shows unexplained gaps in the chain.

The ruling also cited People v. Seguiente, People v. Rojas, and People v. Vistro, where the Court similarly acquitted accused persons due to non-compliance with the witness requirement during inventory and other chain of custody lapses.

Practical Takeaways

• The three-witness rule is mandatory. During the physical inventory of seized drugs, the presence of the accused (or their representative), a media representative, a DOJ representative, and an elected public official is required. The absence of any of these witnesses must be justified.
• Every link must be proven. The prosecution must account for the seized item from seizure and marking, to turnover to the investigating officer, to the forensic chemist, and finally to the court. Gaps in testimony can be fatal to the case.
• Marking should be done immediately. The arresting officer should mark the seized item at the place of arrest, if practicable, to preserve its identity.
• Documentation matters. Chain of custody forms, inventory receipts, and photographs are essential, but they must be supported by testimony that explains each transfer of custody.
• Presumption of regularity is not automatic. Police officers cannot simply invoke regularity in the performance of their duties when the record shows unexplained procedural lapses.

The Lacdan case illustrates that procedural safeguards in drug cases are not mere technicalities. They protect the accused from the risk of tampered or substituted evidence. For law enforcement, strict adherence to the chain of custody rule is not just a legal requirement—it is the foundation of a fair trial.

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