Chain of Custody in Drug Cases: Why the Drug Itself Must Be Proven

The Supreme Court has repeatedly stressed that in drug cases, the prosecution must do more than prove that a crime occurred. It must also prove that the exact drugs seized from the accused are the same drugs presented in court. In People v. Sembrano (G.R. No. 238829, October 15, 2018), the Court acquitted an accused because the prosecution failed this crucial requirement. The case is a clear reminder that the rules on chain of custody are not mere technicalities — they protect the accused from potential police abuse.

The Facts of the Case

On December 13, 2011, operatives of the Baguio City Anti-Illegal Drugs – Special Operation Task Group conducted a test-buy operation against Concepcion Sembrano y Cruz. A confidential informant bought a plastic sachet of suspected shabu for P5,000.00. The sachet was marked "GBB" by PO2 Geoffrey Bantule. Laboratory examination later confirmed it contained methamphetamine hydrochloride.

That same evening, the team conducted a buy-bust operation. The poseur-buyer, SPO1 Reynaldo Badua, bought another sachet for P7,000.00, which he marked "RCB." An inventory and photography were conducted in the presence of an elected official and representatives from the Department of Justice and media. The seized item was sent to the crime laboratory and confirmed to be shabu.

Sembrano was charged with illegal sale of dangerous drugs under Section 5, Article II of Republic Act No. 9165. The Regional Trial Court convicted her, and the Court of Appeals affirmed. She appealed to the Supreme Court.

The Issue

The central issue was whether the prosecution had sufficiently established the identity and integrity of the seized drugs — specifically, whether the sachet marked "RCB" from the buy-bust operation was the same item offered in evidence.

The Ruling: Acquittal for Broken Chain of Custody

The Supreme Court reversed the conviction and acquitted Sembrano. The Court held that the prosecution failed to prove the integrity of the corpus delicti — the drug itself — which is an essential element of the crime.

The problem emerged during cross-examination of SPO1 Badua. The photographs taken during the inventory showed a sachet marked "GBB" — the item from the test-buy operation — instead of the "RCB" sachet from the buy-bust operation. SPO1 Badua admitted the mistake, saying that a colleague may have given the wrong pictures. He could not confirm that the photographed sachet was the same one seized from Sembrano.

The Court found this fatal. When the law requires that drugs be physically inventoried and photographed immediately after seizure, the items shown must be the very same drugs on which the charges are based. Any discrepancy must be reasonably explained. Here, the prosecution offered no satisfactory explanation.

The Strict Rules on Chain of Custody

The Court reiterated that the identity of the dangerous drug must be established with moral certainty. The prosecution must account for each link in the chain of custody — from seizure, to marking, to inventory, to laboratory examination, to presentation in court.

Compliance with the chain of custody procedure is strictly required. The Court called it "not merely a procedural technicality but a matter of substantive law," because the law was crafted as a safety precaution against police abuses, especially since the penalty for drug offenses can be life imprisonment.

There is a saving clause found in Section 21(a), Article II of the Implementing Rules and Regulations of RA 9165, later adopted into RA 10640. It allows non-compliance with the procedure if: (a) there is a justifiable ground for non-compliance, and (b) the integrity and evidentiary value of the seized items are properly preserved. But the prosecution must prove the justifiable ground as a fact. The Court cannot presume what these grounds are or that they even exist.

The Court also cited People v. Miranda (G.R. No. 229671, January 31, 2018), reminding prosecutors that the State has a positive duty to account for any lapses in the chain of custody, even if the defense does not raise the issue at trial.

Practical Takeaways

• The drug itself is the evidence. In drug cases, the prohibited drug is the corpus delicti. If its identity cannot be proven, the case fails.
• Marking, inventory, and photography must be accurate. The items photographed and inventoried must be the same items seized from the accused. Mix-ups, like photographing the wrong sachet, can be fatal.
• The saving clause is not automatic. Non-compliance with chain of custody rules can be excused only if the prosecution proves a justifiable ground and shows the drugs' integrity was preserved.
• Prosecutors must be proactive. The State must account for lapses even if the defense does not raise them. Failure to do so risks an acquittal on appeal.
• For the accused, technical errors matter. A conviction can be overturned if the chain of custody is broken, even if the accused's defense is weak.

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