Chain of Custody Lapses and Reasonable Doubt in Drug Cases: People v. Seguiente

In drug prosecutions, the prosecution must prove guilt beyond reasonable doubt — and that includes showing that the seized drugs presented in court are exactly the same items confiscated from the accused. When police officers fail to follow the custody and disposition rules under the Comprehensive Dangerous Drugs Act, the evidence may become doubtful, and the accused may be acquitted. The Supreme Court's decision in People v. Seguiente y Ramirez (G.R. No. 218253, June 20, 2018) illustrates this principle clearly.

The Facts of the Case

In April 2006, police officers in Zamboanga City conducted a buy-bust operation against Evelyn Seguiente, who was suspected of selling shabu. A poseur-buyer approached her and purchased Php100.00 worth of shabu using marked money. After the pre-arranged signal, the back-up officers arrested her. A search of her person yielded the marked money and another sachet of shabu.

The officers brought Seguiente to the police station, where the seized items were marked with the officers' initials. An inventory was later prepared, and the items were turned over to a case investigator who brought them to the PNP Crime Laboratory. Laboratory examination confirmed the sachets contained methamphetamine hydrochloride.

Seguiente was charged with illegal sale and illegal possession of shabu under Sections 5 and 11, Article II of Republic Act No. 9165. The trial court convicted her, and the Court of Appeals affirmed. She appealed to the Supreme Court.

The Issue: Did the Prosecution Prove Guilt Beyond Reasonable Doubt?

The central question was whether the prosecution adequately established the chain of custody of the seized drugs. Seguiente argued that the police failed to comply with the requirements of Section 21 of RA 9165 — specifically, the physical inventory and photographing of the seized items in the presence of the accused and the required witnesses.

The Ruling: Procedural Lapses Created Reasonable Doubt

The Supreme Court ruled in favor of Seguiente and acquitted her. The Court found several serious procedural lapses:

Marking not done in the accused's presence. While the officers testified that they marked the seized sachets at the police station, there was no evidence that the marking was done in the presence of Seguiente or her representative. The Court cited People v. Salonga for the rule that marking "must always be done in the presence of the accused or his representative."

Incomplete inventory. Although a Certificate of Inventory existed, only one signature appeared on it — that of the intelligence operative. There was no showing that the inventory was conducted in the presence of Seguiente, a media representative, a Department of Justice representative, or an elected public official, as the law requires.

No photographs taken. The prosecution admitted that no photographs of the seized items were taken. The Court noted that photographs are intended by law to confirm the chain of custody.

No explanation for the lapses. The prosecution offered no justification for its non-compliance. The Court explained that while Section 21 of the IRR (as amended by RA 10640) provides a saving clause, the prosecution must first acknowledge the procedural lapses and provide justifiable grounds for them, and then prove that the integrity and evidentiary value of the seized items were preserved. Here, the prosecution did neither.

Citing People v. Relato, the Court emphasized that the State does not establish the corpus delicti when substantial gaps in the chain of custody raise grave doubts about the authenticity of the prohibited substance presented in court. These lapses, especially in the face of an allegation of frame-up, effectively produced serious doubts on the integrity and identity of the evidence.

Practical Takeaways

• Chain of custody is not a mere technicality. In drug cases, the prosecution must account for every link in the chain — from seizure to laboratory examination to presentation in court. Any substantial gap can be fatal to the case.
• Marking must be done in the accused's presence. While marking can be done at the police station rather than at the scene of arrest, it must still be done in the presence of the accused or their representative.
• The witnesses required by law matter. The physical inventory and photographing must be done in the presence of the accused (or their representative or counsel), an elected public official, and a representative of the National Prosecution Service or the media. All must sign the inventory and receive copies.
• The saving clause is not automatic. Non-compliance with Section 21 does not automatically invalidate the seizure, but the prosecution must explain the lapses and show that the integrity of the evidence was preserved. Silence on these points invites acquittal.
• For the defense, document everything. When challenging a drug conviction, focus on the gaps in the chain of custody — missing signatures, absent witnesses, unphotographed items, and unexplained deviations from the procedure.

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