Chain of Custody in Drug Cases: Why Strict Compliance Matters in Philippine Law

In drug cases, the prosecution's success often hinges on a seemingly procedural detail: how the seized drugs were handled from the moment of arrest to their presentation in court. The Supreme Court's recent ruling in People v. Sayson (G.R. No. 249289, September 28, 2020) underscores this point, acquitting an accused because police officers failed to comply with the mandatory witness requirement during the inventory of seized items.

The case serves as a critical reminder that in prosecutions under the Comprehensive Dangerous Drugs Act of 2002 (RA 9165), the integrity of the seized drugs—not just the fact of possession—must be established beyond reasonable doubt.

The Facts of the Case

On July 25, 2016, police officers in Quezon City conducted a buy-bust operation against Joseph Sayson y Parocha based on information from a confidential informant. During the operation, police recovered one sachet of suspected shabu from him, and upon frisking, found five more sachets. Because a crowd gathered at the scene, the arresting officer brought the seized items to the Barangay Hall of Tatalon for marking and inventory. The inventory was witnessed only by the barangay hall's duty desk officer.

Sayson was charged with illegal sale and illegal possession of dangerous drugs. The Regional Trial Court convicted him of illegal possession, sentencing him to 12 years and one day to 14 years imprisonment, plus a fine of P300,000. The Court of Appeals affirmed the conviction, ruling that the marking at the barangay hall was justified given the commotion at the crime scene, and that the buy-bust team exerted earnest efforts to contact the required witnesses.

The Issue Before the Supreme Court

The sole issue was whether the Court of Appeals erred in affirming Sayson's conviction for illegal possession of dangerous drugs under Section 11, Article II of RA 9165.

The Supreme Court's Ruling

The Supreme Court granted the petition and acquitted Sayson. The Court emphasized that in prosecutions for illegal possession of dangerous drugs, the prosecution must establish three elements: (a) the accused possessed an item identified as a prohibited drug; (b) such possession was not authorized by law; and (c) the accused freely and consciously possessed the drug.

Crucially, the Court reiterated that the identity of the dangerous drug must be established with moral certainty. This requires the prosecution to account for each link in the chain of custody—from seizure to presentation in court. Under Section 21 of RA 9165, as amended by RA 10640, the marking, physical inventory, and photographing of seized items must be conducted immediately after seizure, in the presence of the accused or his representative, and with required witnesses: an elected public official and a representative of the National Prosecution Service or the media.

Why the Conviction Was Overturned

The Court found that the witness requirement was not met. The inventory was witnessed only by the barangay hall's duty desk officer—a clear failure to comply with the mandatory witness requirement under RA 10640, which applies because the offense was committed after its effectivity on August 7, 2014.

The Court rejected the prosecution's claim that police tried to contact the required witnesses but none arrived. Citing People v. Santos (G.R. No. 243627, November 27, 2019), the Court held that mere statements of unavailability, absent actual serious attempts to contact witnesses, are unacceptable as justifiable grounds for non-compliance.

The Court also cited People v. Gabunada (G.R. No. 242827, September 9, 2019), explaining that police officers are ordinarily given sufficient time—from receiving information about a suspect's activities until the arrest—to prepare for a buy-bust operation and make necessary arrangements to comply with the chain of custody rule.

Because the integrity and evidentiary value of the seized items were compromised, the Court ruled that the conviction must be overturned.

Practical Takeaways

• Strict compliance is the rule. Police must secure the presence of required witnesses—an elected public official and a representative of the NPS or media—during the marking and inventory of seized drugs. Deviation is allowed only with justifiable grounds and proof that the integrity of the evidence was preserved.

• Mere claims of effort are not enough. Police cannot simply say they tried to contact witnesses. They must show genuine, sufficient, and actual attempts to secure their presence.

• Preparation is key. Since buy-bust operations are typically planned in advance, police have ample time to arrange for witnesses. Failure to do so may be treated as negligence, not necessity.

• For the accused, procedural lapses matter. A conviction may be overturned if the prosecution fails to account for every link in the chain of custody, even if the accused was caught with drugs.

• For lawyers, scrutinize the chain. Defense counsel should carefully examine the prosecution's evidence on how seized items were handled, marked, inventoried, and preserved.

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