Chain of Custody in Drug Cases: Ensuring Evidence Integrity in the Philippines

In drug cases, the seized substance is the very corpus delicti—the body of the crime. If its identity and integrity are compromised, conviction becomes impossible. In People v. Dungo (G.R. No. 229720, August 19, 2019), the Supreme Court acquitted an accused because the prosecution failed to establish an unbroken chain of custody over the seized shabu. The case is a stark reminder that the presumption of regularity in police work cannot substitute for actual compliance with the law.

The Facts of the Case

In September 2009, police in Sto. Tomas, Pampanga conducted a buy-bust operation against a certain "Ogag," later identified as Melvin Dungo. A poseur-buyer handed P500 to Dungo, who gave two plastic sachets of suspected shabu in return. The arresting officer marked the sachets with the initials "JBL-1" and "JBL-2" at the scene. The items were later brought to the police station, where an inventory and confiscation report were prepared.

However, several procedural gaps emerged. No representatives from the Department of Justice (DOJ) or the media were present during the inventory. The barangay captain who testified was not even present at the inventory, and the two barangay kagawads who allegedly witnessed it were never presented in court. Worse, the police officer who delivered the drugs to the crime laboratory did not testify, and the forensic chemist admitted he had no knowledge whether the specimens he examined were the same ones seized from Dungo.

The Legal Framework: Section 21, RA 9165

Section 21 of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002, prescribes the procedure for handling seized drugs. The apprehending team must, immediately after seizure, physically inventory and photograph the items in the presence of:

1. The accused or his representative or counsel;
2. A representative from the media;
3. A representative from the DOJ; and
4. Any elected public official.

These witnesses must sign the inventory and receive copies. The Implementing Rules and Regulations allow marking and inventory at the nearest police station if practicable, but the presence of the required witnesses remains mandatory.

The Four Links of the Chain

The prosecution must account for every link in the chain of custody:

1. Seizure and marking of the illegal drug by the apprehending officer;
2. Turnover to the investigating officer;
3. Turnover by the investigating officer to the forensic chemist; and
4. Turnover and submission from the forensic chemist to the court.

Marking is the starting point of the custodial link. It ensures that the items seized are the same items presented in court and protects both the accused from planted evidence and police officers from baseless harassment suits.

Non-Compliance Requires Justification

The Court in Dungo emphasized that non-compliance with Section 21 does not automatically render seized items inadmissible. The saving clause applies only when two elements concur: (1) there is a justifiable ground for the deviation, and (2) the integrity and evidentiary value of the seized items were preserved.

Crucially, these grounds must be alleged and proven by the prosecution. The Court cannot presume their existence. In People v. De Guzman, the Court held that the justifiable ground for non-compliance must be proven as a fact. The apprehending officers must state their compliance—or their justification for non-compliance—in their sworn affidavits.

The Ruling: Acquittal on Reasonable Doubt

The Supreme Court reversed Dungo's conviction. The prosecution failed to acknowledge, much less justify, the numerous deviations: the absence of DOJ and media representatives, the failure to present the witnessing kagawads, the unexplained role of the officer who delivered the drugs to the laboratory, and the forensic chemist's admission of uncertainty about the specimen's identity.

The Court stressed that the presumption of regularity in the performance of official duty "stands only when no reason exists in the records by which to doubt the regularity of the performance of official duty." Here, the gaps in the chain were too glaring to be ignored. The presumption cannot prevail over the constitutional right to be presumed innocent.

Practical Takeaways

• Comply strictly with Section 21. The presence of the three required witnesses—the accused or counsel, an elected public official, and a DOJ or media representative—is mandatory.
• Document everything. Marking, inventory, and photography must be done properly, and the officers must state their compliance in sworn affidavits.
• Justify any deviation. If compliance is impossible, the justification must be stated in the affidavits and proven during trial. The prosecution cannot rely on the presumption of regularity to fill gaps.
• Present all handlers as witnesses. Every person who touched the seized item must testify to preserve the chain of custody.
• For prosecutors: Do not file cases when the affidavits lack compliance statements or justifications. The Court has made this a mandatory policy.

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