Dangerous Drugs Act: Why Broken Chain of Custody Leads to Acquittal

In a significant ruling on drug cases, the Supreme Court acquitted an accused charged with illegal sale of shabu because the prosecution failed to establish an unbroken chain of custody over the seized drugs. The case of People v. Constantino, Jr. (G.R. No. 199689, March 12, 2014) underscores a crucial principle: in prosecutions under the Comprehensive Dangerous Drugs Act of 2002 (Republic Act No. 9165), the prosecution must prove not only that a sale took place, but also that the drugs presented in court are the very same items seized from the accused.

The Facts of the Case

On January 20, 2005, police officers in Tuguegarao City conducted a buy-bust operation against Hermanos Constantino, Jr., who was suspected of selling shabu. A poseur-buyer approached Constantino and asked to buy P1,000.00 worth of shabu. After the exchange—two plastic sachets for marked money—the poseur-buyer gave the pre-arranged signal, and the rest of the team arrested Constantino.

The seized sachets were brought to the police station and later submitted to the crime laboratory, which confirmed they contained methamphetamine hydrochloride. Constantino was charged with illegal sale of drugs under Section 5, Article II of RA 9165. Both the Regional Trial Court and the Court of Appeals convicted him, imposing life imprisonment and a fine of P500,000.00.

The Issue

On appeal, Constantino argued that the prosecution failed to establish the chain of custody of the seized drugs. Specifically, he pointed to conflicting testimonies about who marked the plastic sachets and when the markings were made.

The Ruling: Chain of Custody Is Crucial

The Supreme Court reversed the conviction and acquitted Constantino. The Court emphasized that while denial and frame-up are weak defenses, the prosecution must still prove guilt beyond reasonable doubt on its own merits.

In drug cases, the Court explained, what is material is proof that the sale actually took place, coupled with the presentation in court of the corpus delicti—the illegal drug itself. This requires the prosecution to preserve the identity and integrity of the seized drugs from the moment of confiscation until presentation in court.

The Legal Framework

Section 21(1) of RA 9165 requires the apprehending team to physically inventory and photograph seized drugs immediately after confiscation, in the presence of the accused or his representative, a media representative, a DOJ representative, and an elected public official.

While the Implementing Rules and Regulations allow non-compliance under justifiable grounds, this is only excused if the integrity and evidentiary value of the seized items are properly preserved. That preservation is demonstrated through an unbroken chain of custody.

The Fatal Flaw: Conflicting Testimonies on Marking

The Court found glaring inconsistencies in the prosecution's evidence. Three different witnesses gave three different accounts of who marked the sachets:

• The poseur-buyer testified that Investigator SPO2 Tamang placed the markings "NBT" at the police station.
• Another team member testified that SPO2 Taguiam placed the markings after the operation.
• The forensic chemist testified that the markings were made by SPO3 Tamaray, the duty officer at the crime laboratory.

The Court noted that the poseur-buyer, who had immediate custody of the sachets, failed to mark them right after seizure. This lapse "opened the door for confusion and doubt" about whether the drugs presented in court were the same ones seized from the accused.

Citing People v. Zakaria, the Court stressed that marking the seized item immediately after seizure is the "starting point in the custodial link." Failure to do so imperils the integrity of the entire chain. The prosecution could have clarified the matter by presenting the officers who allegedly made the markings, but it chose not to.

Practical Takeaways

• Mark evidence immediately. The first crucial step in the chain of custody is marking the seized item right after seizure. Delays or inconsistencies in marking can break the chain and lead to acquittal.
• Consistent testimony matters. Conflicting accounts from prosecution witnesses about who handled or marked the evidence create reasonable doubt.
• Present all links in the chain. The prosecution should present every person who handled the seized item, from the apprehending officer to the forensic chemist, to establish an unbroken chain.
• Substantial compliance has limits. While the law excuses non-compliance with Section 21 under justifiable grounds, the integrity of the evidence must still be preserved. A broken chain is fatal.
• For the defense, scrutinize the custody trail. In drug cases, the defense should focus on gaps or inconsistencies in how the drugs were handled, marked, and transmitted—these can be the key to an acquittal.

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