Chain of Custody Is Key: How Police Inconsistencies Can Lead to Acquittal in Drug Cases

The Supreme Court has repeatedly stressed that in drug cases, the prosecution must prove not only that the accused possessed illegal drugs, but also that the drugs presented in court are exactly the same items seized from the accused. This requirement, known as the chain of custody rule, exists to protect the accused from being convicted based on evidence that may have been tampered with or substituted.

In Ulep v. People (G.R. No. 183849, June 11, 2011), the Court showed how seriously it takes this rule. Because the arresting officers gave irreconcilable testimonies and failed to properly mark the seized items, the accused was acquitted on reasonable doubt.

The Facts of the Case

Domingo Ulep was charged with aggravated illegal possession of shabu before the Regional Trial Court (RTC) of Laoag City. The prosecution claimed that on May 8, 2005, acting on a tip, police officers PO2 Elizer Tuzon and SPO3 Rogelio Labutong went to Barangay 13, San Nicolas, Ilocos Norte. There, they allegedly saw Ulep walking on the street holding a plastic sachet. The officers seized two sachets of what appeared to be shabu, arrested Ulep, and turned over the items to the police station and eventually to the crime laboratory, which confirmed the substance was shabu.

Ulep gave a different account. He said he was waiting for a ride when the officers approached and frisked him. Finding nothing, they let him go. As he walked away, he saw a companion of the officers waving a plastic sachet. The officers then approached him again and claimed the sachet belonged to him.

The RTC convicted Ulep, and the Court of Appeals affirmed. The Supreme Court reversed.

The Issue: Conflicting Testimonies

The trial court itself noted the contradictions between the two arresting officers. But it dismissed these as minor and even said they made the testimonies appear unrehearsed and more truthful. The Supreme Court disagreed.

The inconsistencies were far from minor:

• On the source of the tip: Tuzon said a police asset directly told him Ulep was about to buy shabu. Labutong said the Chief Police Inspector relayed the information.
• On prior surveillance: Labutong said Ulep had been under surveillance for a month as a drug user. Tuzon said they only met Ulep after his arrest.
• On the mode of transport: Tuzon said they arrived in a tricycle he drove. Labutong insisted they came in a patrol car he drove.

The Court ruled these were irreconcilable and "bear the signs of poor fabrication." When police officers cannot agree on basic facts of their own operation, their credibility collapses.

The Issue: Broken Chain of Custody

The Court also found a fatal flaw in how the seized items were handled. Under the rules, when drugs are seized, the police officer must immediately place identifying marks on the sealed sachets, or if not sealed, place them in a container, seal it, and mark the cover. This prompt marking is the starting point of the custodial link.

In this case, no one marked the sachets at the scene. The markings were made later at the police station, and the officers could not even agree on who made them. Tuzon said Labutong marked the sachets; Labutong said SPO2 Butay did it.

Because of this, the Court could not be sure that the specimens presented in court were the same ones seized from Ulep. This doubt went to the very heart of the case—the corpus delicti itself.

The Ruling

The Supreme Court granted the petition and acquitted Ulep on reasonable doubt. The Court reminded law enforcement that failure to observe basic rules in drug cases results not only in acquittals but also in wasted time and effort.

Practical Takeaways

• Mark seized items immediately. The marking of confiscated drugs must be done at the scene of seizure, not later at the police station. This is the first link in the chain of custody.
• Consistency matters. Police officers testifying in the same operation must give consistent accounts of basic facts. Irreconcilable testimonies can destroy the prosecution's case.
• Chain of custody protects the accused. The rule ensures that the drugs presented in court are the same items seized. Any break in the chain creates reasonable doubt.
• Training and discipline are essential. Drug enforcement agencies must train officers on proper procedure and remove those who refuse to follow it.
• For the accused, credibility of witnesses is key. A conviction cannot stand if the prosecution's witnesses contradict each other on material points.

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