Chain of Custody in Drug Cases: Why Missing Witnesses Can Mean Acquittal

In drug cases, the seized substance is the very heart of the prosecution's case. If the State cannot prove that the drugs presented in court are the same items seized from the accused, the case falls apart. In Duarte v. People (G.R. No. 238971, August 28, 2019), the Supreme Court reminded law enforcers and prosecutors that strict compliance with the chain of custody rule is not a mere technicality—it is substantive law. The Court acquitted Charben Duarte y Oliveros of illegal possession of dangerous drugs under Section 11, Article II of Republic Act No. 9165 because the police failed to justify the absence of required witnesses during the physical inventory.

The Facts of the Case

On January 20, 2014, around five in the morning, police officers responded to a report of a shooting incident in Caloocan City. Upon arrival, they found Duarte lying on the ground with a gunshot wound. As the officers approached, they noticed a gun tucked at his waist. After taking the gun, an officer conducted a body search and recovered a black sling bag containing a grenade, a plastic sachet of white crystalline substance, and drug paraphernalia.

The officers marked the seized items, informed Duarte of his rights, and brought him to the hospital. Later, they turned over the items to the Station Anti-Illegal Drugs Special Operation Unit, where a physical inventory was conducted. The inventory was witnessed only by a barangay kagawad and the police officer himself—no representative from the Department of Justice (DOJ) or the media was present. The seized substance later tested positive for shabu.

Duarte was charged with illegal possession of dangerous drugs and drug paraphernalia. The trial court convicted him of illegal possession of dangerous drugs but acquitted him of the paraphernalia charge. The Court of Appeals affirmed the conviction, ruling that the police substantially complied with the chain of custody rule and that the absence of DOJ and media representatives was "forgivable."

The Issue Before the Supreme Court

The central question was whether the prosecution sufficiently established the identity and integrity of the seized drugs, given the absence of the required witnesses during the physical inventory.

The Ruling: Compliance Is Mandatory

The Supreme Court reversed the conviction and acquitted Duarte. The Court held that in illegal possession cases, the dangerous drug itself forms an integral part of the corpus delicti of the crime. The prosecution must establish the identity of the drug with moral certainty by accounting for every link in the chain of custody—from seizure to presentation in court.

Under Section 21, Article II of RA 9165, the physical inventory and photography of seized items must be conducted in the presence of the accused or his representative, and in the presence of three witnesses: an elected public official, a representative from the media, and a representative from the DOJ. (After the amendment by RA 10640 in 2014, the requirement became two witnesses: an elected public official and a representative of the National Prosecution Service or the media.)

The Court emphasized that these witness requirements exist to prevent switching, planting, or contamination of evidence. While the law recognizes a saving clause for non-compliance under justifiable grounds, the prosecution must prove two things: (1) that there was a justifiable reason for the absence, and (2) that the integrity and evidentiary value of the seized items were properly preserved.

Crucially, the Court stressed that the prosecution must explain the reasons behind procedural lapses. Mere statements of unavailability, without showing actual serious attempts to secure the witnesses, are unacceptable. Police officers are ordinarily given sufficient time to prepare for operations and make necessary arrangements, knowing they must strictly comply with the chain of custody rule.

In this case, the inventory receipt showed only the signature of the barangay kagawad. The prosecution presented no evidence of any effort to secure the presence of DOJ or media representatives. The Court noted that when the defense pointed out the absence during cross-examination, the prosecution failed to elicit any explanation from the arresting officer about earnest efforts made. This unjustified deviation compromised the integrity and evidentiary value of the seized items, warranting acquittal.

Practical Takeaways

• Witnesses are mandatory, not optional. The presence of the required witnesses during inventory and photography is a substantive requirement, not a mere procedural formality. Police must secure an elected public official and, depending on the applicable law, a DOJ or media representative (or a National Prosecution Service representative after RA 10640).

• Document every effort. If a required witness cannot be present, the prosecution must prove that genuine and sufficient efforts were made to secure their attendance. Vague claims of unavailability will not suffice—actual attempts must be shown.

• Marking can be done at the station. The law allows marking of seized items at the nearest police station or office of the apprehending team, not necessarily at the place of arrest. This does not impair the integrity of the evidence.

• The burden is on the prosecution. The State has the positive duty to account for any lapses in the chain of custody, even if the defense does not raise the issue at trial. Failure to do so risks reversal on appeal.

• For defense lawyers: Point out any missing witness or unexplained gap in the chain of custody during cross-examination. The prosecution's failure to justify the lapse can be the basis for acquittal.

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