Chain of Custody in Firearm Cases: When Delayed Marking Leads to Acquittal

In a significant ruling, the Supreme Court En Banc acquitted Tony Baclig II of illegal possession of firearm and ammunition, holding that while firearms cases do not require the strict chain of custody rules applied in drug cases, the prosecution must still account for basic evidentiary safeguards. The Court's decision in Baclig v. People (G.R. No. 252644, April 8, 2026) clarifies when delayed marking of seized firearms can create reasonable doubt sufficient for acquittal.

The Facts of the Case

On the evening of October 2, 2016, police officers on mobile patrol in Tayug, Pangasinan, came upon a motorcycle accident. They stopped to assist the rider, petitioner Tony Baclig II, who had fallen on the road. When asked for his driver's license, Baclig opened his sling bag, and the officers saw a.45 caliber Taurus pistol inside. They confiscated the firearm, which was loaded with seven live rounds, and arrested Baclig when he failed to produce a license to possess the weapon. A subsequent search incident to arrest yielded another magazine with six bullets.

The firearm and ammunition were marked with the arresting officer's initials—but only later at the police station, not at the place of seizure. The prosecution presented testimonial and documentary evidence, including a ballistics report, and the Regional Trial Court convicted Baclig. The Court of Appeals affirmed.

The Issue

The central question was whether the prosecution had proven Baclig's guilt beyond reasonable doubt, specifically whether the items presented in court were the same items seized from him.

The Ruling: Valid Seizure, But Broken Chain

The Supreme Court first ruled that the firearm was validly seized under the plain view doctrine. The officers had a prior justification to approach Baclig—they were assisting an accident victim. The discovery of the gun was inadvertent, and it was readily apparent that possessing it without a license was a crime. The subsequent arrest and search incident to arrest were likewise lawful.

However, the Court found a critical evidentiary lapse: the arresting officers failed to mark the firearm at the place of seizure, and the prosecution offered no explanation for this omission.

Chain of Custody: A Different Standard for Firearms

The Court distinguished firearms from dangerous drugs. Under Section 21 of Republic Act No. 9165 (Comprehensive Dangerous Drugs Act), strict compliance with marking, inventory, and custodial procedures is required because drugs are non-unique and easily substituted. Firearms, by contrast, are physically unique—identifiable by serial numbers and engravings—and relatively resistant to change.

Citing People v. Olarte and Togado v. People, the Court explained that for unique, readily identifiable evidence, the prosecution need only present testimony from a witness with knowledge that the evidence is what the proponent claims. A detailed chain of custody is not mandatory in firearm cases.

However, the Court emphasized that firearms and ammunition are still susceptible to planting. Thus, police officers must undertake reasonable measures to preserve the integrity of seized items. The Court adopted the following guidelines:

1. The firearm or ammunition must be presented in court as the best evidence of its existence and classification.
2. A detailed chain of custody is not mandatory, but reasonable measures must preserve identity and integrity.
3. Where firearms are seized through a search warrant or buy-bust operation, immediate marking, inventory, and photographing must be done at the place of seizure in the presence of required witnesses. Where seized after a warrantless arrest, immediate marking, inventory, and photographing at the place of arrest are still required.
4. Procedural irregularities do not automatically result in acquittal—but if lapses remain unexplained and identity cannot otherwise be established, reasonable doubt may arise.

Why Baclig Was Acquitted

The Court found that the arresting officers' failure to immediately mark the firearm at the place of seizure—an omission left wholly unexplained—constituted an unresolved break in the evidentiary chain. While a less stringent standard governs firearms cases, the complete absence of justification for dispensing with this basic safeguard engendered doubt as to the identity and integrity of the seized item.

The Court stressed that the burden of proving guilt beyond reasonable doubt rests solely on the prosecution. Where the case hinges on the existence and identity of the firearm, and procedural safeguards essential to establishing that identity are neither observed nor explained, acquittal becomes the inevitable consequence.

Practical Takeaways

• Mark evidence immediately. Police officers should mark seized firearms and ammunition at the place of seizure, not later at the station, unless there is a justifiable reason.
• Document everything. Conducting an inventory and taking photographs at the place of arrest strengthens the prosecution's case and guards against allegations of evidence planting.
• Explain any lapse. If immediate marking is impossible, the prosecution must offer sufficient justification; unexplained omissions can create reasonable doubt.
• Firearms are not drugs. Courts will not impose the strict Section 21 (RA 9165) requirements on firearm cases, but basic safeguards still apply.
• For the defense, the absence of immediate marking, without explanation, can be a powerful ground for acquittal even where the seizure itself was lawful.

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