Drug Sale Conviction Reversed: How the Chain of Custody Rule Protects the Accused

The Supreme Court's 2010 decision in People of the Philippines v. Joselito Nasara y Dahay (G.R. No. 188328, August 25, 2010) is a reminder that even a buy-bust operation supported by eyewitness testimony can collapse if law enforcers do not follow the strict procedures for handling seized drugs. The case shows how the chain of custody rule under Republic Act No. 9165, the Dangerous Drugs Act of 2002, protects the accused by ensuring that the substance presented in court is the very same substance seized.

The buy-bust operation

Acting on a confidential informant's report, police officers from Station 6 in Batasan Hills, Quezon City conducted a buy-bust operation along San Miguel Street, Payatas, on March 16, 2004. SPO2 Rodelio Dionco was designated as the poseur-buyer and given two 100-peso bills.

The informant introduced SPO2 Dionco to the appellant and another man, "Kune," as a prospective buyer. The appellant took the money and, with Kune, entered a nearby house. When they returned, Kune handed SPO2 Dionco a small plastic sachet containing a white crystalline substance. After examining it, SPO2 Dionco gave the pre-arranged signal by scratching his head.

The back-up officers moved in, but the appellant and Kune fled. The police caught the appellant but not Kune. They recovered the buy-bust money from the appellant's pocket. Inside the house, SPO2 Dionco also found two more plastic sachets on top of a television set. These were marked by PO2 Lopez with his initials.

The charge and conviction

The appellant was charged with selling dangerous drugs under Section 5, Article II of R.A. No. 9165. The exact text of that provision is not in the ASG law library, so it is described here only in general terms: it penalizes the sale, trading, administration, dispensation, delivery, distribution, and transportation of dangerous drugs and/or controlled precursors and essential chemicals. The Information alleged the sale of 0.03 grams of methylamphetamine hydrochloride, commonly known as shabu.

The Regional Trial Court of Quezon City convicted the appellant, sentencing him to life imprisonment and a fine of P500,000. The Court of Appeals affirmed the conviction, prompting the appellant to elevate the case to the Supreme Court.

The core issue: non-compliance with Section 21

The appellant argued that the police failed to comply with Section 21 of R.A. No. 9165, which governs the custody and disposition of confiscated drugs. The decision quotes that provision as requiring the apprehending team, immediately after seizure and confiscation, to physically inventory and photograph the drugs in the presence of the accused or the person from whom the items were taken, or their representative or counsel, a representative from the media and the Department of Justice, and any elected public official who must sign the inventory copies and be given a copy.

The Supreme Court found that the records showed no physical inventory and no photographs were taken. On that ground alone, the Court held, the prosecution's case failed, absent a plausible explanation justifying the non-compliance.

The Court also noted there was no showing that the police coordinated with the Philippine Drug Enforcement Agency (PDEA) before and after the buy-bust operation, as required by Section 86(a) of the Implementing Rules and Regulations of R.A. No. 9165. The decision quotes that rule as directing law enforcement agencies to coordinate with PDEA prior to anti-drug operations, as far as practicable, and to inform PDEA of such operations within twenty-four hours from actual custody of the suspects or seizure of the drugs.

Why the chain of custody matters

The Court distinguished between admissibility and probative value. Non-compliance with Section 21 does not automatically make the evidence inadmissible; rather, it affects its weight or evidentiary merit.

Citing People v. Dela Cruz (G.R. No. 181545, October 8, 2008), the Court explained that the chain of custody rule requires testimony about every link in the chain — from the moment the item was seized to the time it was offered in evidence. Each person who handled the exhibit must describe how and from whom it was received, where it was, what happened to it while in their possession, and the precautions taken to ensure it was not changed or tampered with.

In this case, the chain was broken. SPO2 Dionco failed to mark the first sachet — the very sachet that was the subject of the sale and the basis of the Information. The Court also noted that the sachets were delivered to the PNP Crime Laboratory more than eight hours after they were first taken into custody, and this delay was never explained.

The presumption of regularity cannot save a flawed case

The prosecution relied on the presumption that police officers perform their duties regularly. The Supreme Court rejected this. The presumption was destroyed by the officers' unjustified failure to follow the required procedures. Because the prosecution failed to prove guilt beyond reasonable doubt, the Court reversed the conviction and acquitted the appellant.

Practical takeaways

• Procedure is not a mere formality. In drug cases, the requirements under Section 21 of R.A. No. 9165 — immediate inventory and photography in the presence of required witnesses — are essential to preserve the integrity of the evidence.
• A broken chain of custody weakens the prosecution's case. If the seized drug cannot be reliably traced from seizure to laboratory examination to court presentation, its probative value is compromised.
• Unexplained delays are fatal. The failure to explain why the sachets reached the crime laboratory more than eight hours after seizure contributed to the acquittal.
• The presumption of regularity is not absolute. It cannot be invoked to cure clear procedural lapses by law enforcement officers.
• Coordination with PDEA matters. The Court flagged the absence of PDEA coordination as a further violation of the rules governing anti-drug operations.

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