Chain of Custody in Drug Cases: When Police Lapses Lead to Acquittal

In every prosecution for illegal drugs, the seized substance itself is the very heart of the case. If the prosecution cannot prove that the drugs presented in court are the same ones taken from the accused, the case collapses. In People v. De Guzman (G.R. No. 219955, February 5, 2018), the Supreme Court acquitted an accused because the police committed serious lapses in handling the seized marijuana, breaking the chain of custody.

The Facts of the Case

On November 12, 2009, police in Olongapo City conducted a buy-bust operation against Glenn De Guzman, who was suspected of selling marijuana in his neighborhood. A poseur-buyer purchased a sachet of marijuana for P100.00, and after the transaction, the police arrested De Guzman and recovered additional marijuana from his body.

The police brought the accused and the seized items to the station, where the items were marked and inventoried. However, only two barangay officials were present during the inventory—no representatives from the Department of Justice (DOJ) or the media attended, as required by law. The trial court convicted De Guzman of illegal sale and possession of dangerous drugs under Sections 5 and 11, Article II of Republic Act No. 9165 (the Comprehensive Dangerous Drugs Act of 2002). The Court of Appeals affirmed the conviction.

The Core Issue: Was the Chain of Custody Broken?

The Supreme Court focused on whether the prosecution had proven an unbroken chain of custody over the seized marijuana. Under Section 21, Article II of RA 9165, the apprehending team must conduct a physical inventory and photograph the seized items in the presence of the accused, an elected public official, and a representative from the DOJ or media.

The Court explained that the dangerous drug is the corpus delicti—the body of the crime—and its identity must be proven with moral certainty. The prosecution must show that the drug presented in court is the same one seized from the accused, with no opportunity for tampering, alteration, or substitution.

The Gaps in the Prosecution's Evidence

The Court identified several serious lapses. First, while the items were marked at the police station, there was no evidence that the marking was done in the presence of the accused. Second, the testimonies of the arresting officers were silent on who had custody of the items from the place of arrest until they reached the police station.

Third, the turnover of the drugs to the forensic chemist was not properly established. A certain "PO1 Menor" received the items at the crime laboratory, but neither he nor the investigating officer testified about this transfer. Fourth, and most unusually, the drugs were turned over to the City Prosecutor's Office before being presented in court—an office that has no role in the chain of custody of seized drugs.

The Saving Clause and Why It Did Not Apply

The Court acknowledged that Section 21 contains a saving clause: non-compliance with the procedure does not automatically result in acquittal if there are justifiable grounds and the integrity of the evidence is preserved. However, the prosecution must do two things: recognize and explain the lapses, and demonstrate that the evidence remained intact despite them.

In this case, the prosecution did neither. It failed to explain why the required witnesses were absent and why the drugs passed through the prosecutor's office. The Court also noted that the presumption of regularity in the performance of official duties cannot apply when the official acts are "patently irregular."

Practical Takeaways

• The chain of custody is a strict requirement. In drug cases, the prosecution must account for the seized item at every stage—from seizure and marking, to turnover to the investigating officer, to delivery to the forensic chemist, and finally to the court.
• Compliance with Section 21 matters. The presence of required witnesses during inventory and photographing is mandatory. Police teams should strictly follow the procedure or be ready to explain any deviation.
• Silence is fatal. If the prosecution fails to present testimony covering every link in the chain—including who held the drugs and when—the conviction cannot stand.
• The saving clause has limits. Non-compliance can be excused only with justifiable grounds and proof that the evidence was preserved. Unexplained lapses will not be forgiven.
• For defense lawyers: Scrutinize the chain of custody carefully. Gaps in testimony about the handling of seized drugs can be the basis for acquittal, even when the sale or possession itself appears proven.

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