Chain of Custody in Drug Cases: Why Missing Witnesses Can Overturn a Conviction

In drug cases, the seized substance is the very heart of the prosecution's case. If the government cannot prove that the drugs presented in court are the same items taken from the accused, the case collapses. In Duarte v. People (G.R. No. 238971, August 28, 2019), the Supreme Court reminded law enforcers and prosecutors that skipping the required witnesses during inventory—without a valid explanation—can mean the difference between conviction and acquittal.

The Facts of the Case

In the early morning of January 20, 2014, police officers responded to a shooting incident in Caloocan City. They found Charben Duarte lying on the ground with a gunshot wound. A gun was tucked at his waist, and when he failed to show authority to carry it, the officers conducted a body search. They took a black sling bag from his shoulder and found a grenade, a plastic sachet of what later tested positive for shabu, and drug paraphernalia.

The officers brought the items to their station and later conducted a physical inventory at the Station Anti-Illegal Drugs office. Present during the inventory were the police officer, a barangay kagawad, and Duarte himself. Notably absent were representatives from the Department of Justice (DOJ) and the media, as required by law at that time.

The Regional Trial Court convicted Duarte of illegal possession of dangerous drugs under Section 11, Article II of Republic Act No. 9165. The Court of Appeals affirmed. Duarte appealed to the Supreme Court.

The Issue

The central question was whether the prosecution had sufficiently established the chain of custody of the seized drugs, particularly given the absence of the DOJ and media representatives during the physical inventory.

The Ruling: Acquittal

The Supreme Court reversed the conviction and acquitted Duarte. The Court held that the prosecution failed to justify the absence of the required witnesses, and this failure compromised the integrity and evidentiary value of the seized drugs.

The Chain of Custody Rule

To convict a person of illegal possession of drugs, the prosecution must prove the identity of the drug with moral certainty. The drug itself is the corpus delicti—the body of the crime. Every link in the chain of custody must be accounted for, from seizure to presentation in court.

Under Section 21 of RA 9165, the physical inventory and photography of seized items must be conducted in the presence of the accused (or their representative) and certain witnesses: before the law was amended by RA 10640, these were a representative from the media, a representative from the DOJ, and any elected public official.

The Saving Clause Has Limits

The Court acknowledged that strict compliance is not always possible due to field conditions. The "saving clause" allows non-compliance if the prosecution proves two things: (1) there was a justifiable ground for the lapse, and (2) the integrity and evidentiary value of the seized items were preserved.

But the Court emphasized that the prosecution must duly explain the reasons for the procedural lapse. The justifiable ground must be proven as a fact—the Court cannot presume what these grounds are or that they even exist.

Mere Absence Is Not Enough

For the witness requirement specifically, the prosecution must show that the apprehending officers exerted genuine and sufficient efforts to secure the presence of the required witnesses, even if those efforts ultimately failed. Mere statements of unavailability, without actual serious attempts to contact the witnesses, are unacceptable.

In this case, the receipt of physical inventory showed only the signature of the barangay kagawad. On cross-examination, the defense pointed out the absence of the DOJ and media representatives. The prosecution, however, did not ask the police officer whether any efforts were made to secure their presence.

The Court found this fatal. Because there was no showing of earnest efforts, the deviation from the chain of custody rule was unjustified. The integrity of the seized items was compromised, and the conviction could not stand.

Practical Takeaways

• Police officers must document their efforts. If required witnesses are unavailable, the apprehending team should record the steps taken to contact them—such as calls, visits, or coordination with their offices—to prove earnest effort.
• Prosecutors must anticipate the issue. Even if the defense does not raise the chain of custody, the prosecution has a positive duty to account for any lapses. This includes asking witnesses about the efforts made to secure the presence of required witnesses.
• The saving clause is not automatic. Non-compliance with the chain of custody procedure will not be excused unless the prosecution proves both a justifiable ground and the preservation of the drugs' integrity.
• Marking can be done at the station. The Court reiterated that marking upon immediate confiscation may be done at the nearest police station or office of the apprehending team. This does not, by itself, impair the evidence.
• Strict compliance is substantive law. The chain of custody requirements are not mere procedural technicalities. They are safety precautions against police abuses, especially where the penalty can be life imprisonment.

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