Reasonable Doubt and the Chain of Custody Rule in Drug Sale Cases

In drug cases, the seized substance is the very heart of the prosecution's case. If its identity and integrity are placed in doubt, the entire case collapses. In People v. Bayang (G.R. No. 234038, March 13, 2019), the Supreme Court acquitted two accused persons because the police failed to strictly comply with the chain of custody rule under Section 21 of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002. The ruling is a clear reminder that procedural safeguards exist to protect the innocent, especially where the quantity of drugs seized is minuscule and easily planted or tampered with.

The Facts of the Case

On August 20, 2014, police officers in Pasig City conducted a buy-bust operation against a certain "Tatay," a suspected drug seller. The poseur-buyer, PO2 Santos, and a confidential informant were led by an accused, Jay Cabrido, to the house of Joy Jigger Bayang. Bayang sold a sachet of shabu to the poseur-buyer for P200. After the pre-arranged signal, the team arrested both men and seized additional sachets from their pockets. The items were marked, inventoried at the barangay hall, and later tested positive for methamphetamine hydrochloride.

The trial court convicted both accused of illegal sale and illegal possession of dangerous drugs. The Court of Appeals affirmed. On appeal, the accused argued that the police failed to comply with Section 21, particularly the requirement to have an elected public official and a representative from the National Prosecution Service or the media witness the inventory and photographing of the seized items.

The Issue

The central issue was whether the prosecution had established an unbroken chain of custody over the seized drugs, and whether the failure to secure the required witnesses during the inventory was justified.

The Ruling

The Supreme Court reversed the conviction and acquitted the accused. The Court held that the identity of the prohibited drug must be proven with moral certainty because the drug itself is the corpus delicti of the crime. The prosecution must show an unbroken chain of custody from the moment of seizure up to presentation in court.

Under Section 21 of R.A. No. 9165, as amended by R.A. No. 10640, the physical inventory and photographing of seized items must be done in the presence of the accused or his representative, an elected public official, and a representative of the National Prosecution Service or the media. In this case, the prosecution admitted that no representative from the DOJ or media was present during the inventory. The police officer claimed the media representative was in another place, but the Court found this explanation insufficient.

Significantly, the Court noted that the buy-bust team had received information about the operation at 8:00 a.m. and had the entire day to coordinate with the required witnesses. The failure to do so, without a justifiable reason, was fatal. The Court reiterated the grounds that may excuse non-compliance, such as the remoteness of the area, threats to safety, or earnest efforts that proved futile. None of these were proven here.

Strict Compliance for Minuscule Quantities

The Court emphasized that strict compliance is required where the quantity of drugs is minuscule—here, only 0.07 gram for the sale and 0.04 gram per sachet for possession. Such small amounts are highly susceptible to planting, tampering, or alteration. The saving clause in Section 21 applies only when the prosecution recognizes the lapse, explains a justifiable ground, and proves that the integrity of the evidence was preserved. The prosecution failed on all counts.

Practical Takeaways

• Chain of custody is substantive, not technical. Police must strictly follow Section 21 of R.A. No. 9165, and any deviation must be justified and proven as a fact during trial.
• Two witnesses are now required. After R.A. No. 10640, the inventory must be witnessed by an elected public official and either a DOJ representative or a media representative.
• Small drug quantities demand stricter compliance. The smaller the amount, the greater the risk of planting or tampering, and the higher the court's scrutiny.
• Earnest effort must be shown. Police cannot simply claim that a witness was unavailable; they must show they tried to secure one and that their efforts were futile.
• For the accused, procedural lapses can lead to acquittal. A conviction will not stand if the prosecution fails to prove the integrity of the seized drugs beyond reasonable doubt.

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