Chain of Custody in Drug Busts: Why Missing Witnesses Can Break a Case

In every drug case, the seized substance is the very heart of the prosecution's evidence. If that substance cannot be traced from the moment of seizure to the courtroom, the case collapses. In People v. Flores (G.R. No. 246471, June 15, 2020), the Supreme Court reminded law enforcers that skipping the required witnesses during inventory is a fatal flaw—one that led to the acquittal of an accused drug seller.

The case shows how strictly Philippine courts apply the chain of custody rule under Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002. For anyone facing a drug charge—or for law enforcement officers conducting buy-bust operations—this ruling is essential reading.

The Facts of the Case

On October 13, 2009, police officers in Muntinlupa City conducted a buy-bust operation against Diego Flores, who was suspected of selling shabu to jeepney drivers. A poseur-buyer handed over boodle money, and Flores allegedly gave him a plastic sachet containing white crystalline substance. The team arrested him immediately.

Because a crowd was forming—including Flores's relatives—the police proceeded straight to the station. There, the poseur-buyer marked the sachet with Flores's initials. An inventory and photograph were taken, but only a representative from the City Drug Abuse Prevention and Control Office witnessed it. No media representative, no Department of Justice (DOJ) representative, and no elected public official was present.

The sachet was later tested and found positive for methamphetamine hydrochloride. Flores was charged with illegal sale of dangerous drugs under Section 5, Article II of RA 9165. Both the trial court and the Court of Appeals convicted him, relying on the presumption of regularity in the performance of police duties.

The Issue

The core question was whether the prosecution had established an unbroken chain of custody over the seized drugs. Specifically, did the police comply with Section 21 of RA 9165, which requires that the physical inventory and photograph of seized items be conducted in the presence of certain "insulating witnesses"?

The Ruling: Acquittal

The Supreme Court reversed the conviction and acquitted Flores. The Court held that the prosecution failed to prove an unbroken chain of custody, creating serious doubt about the integrity of the evidence.

The Court explained that in illegal drug cases, the contraband itself is the corpus delicti—the body of the crime. The prosecution must prove that the substance seized from the accused is the same substance offered in court. This requires establishing four links: (1) confiscation and marking by the apprehending officer; (2) turnover to the investigating officer; (3) turnover to the forensic chemist for examination; and (4) submission to the court.

Because the crime happened before RA 10640 amended RA 9165 in 2014, the original Section 21 applied. That provision required the inventory and photograph to be done in the presence of the accused (or a representative), a media representative, a DOJ representative, and an elected public official.

Here, the buy-bust team admitted they no longer waited for the required witnesses so they could deliver the drugs to the laboratory on time. The Court found this unacceptable. Police officers have ample time—from receiving information about the accused until the arrest—to arrange for the presence of these witnesses. A mere statement that witnesses were unavailable, without showing earnest efforts to secure them, is a flimsy excuse.

The Court also noted that the presumption of regularity in police duties cannot prevail over the constitutional presumption of innocence. When the performance of duty is tainted with irregularities, that presumption is destroyed.

Practical Takeaways

• The insulating witnesses matter. Under the original Section 21 of RA 9165, police must have a media representative, a DOJ representative, and an elected public official present during inventory and photograph. Under the amended rule (RA 10640), the requirements are an elected public official and either a National Prosecution Service representative or a media representative.
• Earnest efforts must be shown. If witnesses are absent, the prosecution must prove not just the reason for their absence, but that genuine efforts were made to secure their attendance. A bare claim of unavailability is not enough.
• The chain of custody is a strict requirement. The prosecution must account for the seized drugs at every stage, from seizure to court presentation. Any unexplained gap can be fatal to the case.
• Presumption of regularity is not a shield. Police officers cannot rely on the presumption of regularity when they have clearly deviated from mandatory procedures.
• Timing is no excuse. Police have time to prepare for buy-bust operations. The need to rush evidence to a laboratory does not justify skipping required witnesses.

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