Safeguarding Drug Evidence Strict Compliance With Chain OF Custody Rules

The Supreme Court’s 2019 ruling in Dominguez v. People is a pointed reminder that in drug cases, the prosecution’s burden goes beyond proving possession — it must also show that the evidence was lawfully obtained. Even when an accused fails to object to an illegal arrest, the drugs seized may still be excluded if the search itself was unconstitutional. This article explains the ruling and its practical implications.

The Case at a Glance

Marlon Dominguez was charged with illegal possession of shabu under Section 11, Article II of Republic Act No. 9165. A police officer testified that at around 2:00 a.m., he saw Dominguez standing in an alley holding a small transparent plastic sachet. The officer grabbed Dominguez’s hands, seized the sachet, and arrested him. The sachet later tested positive for methamphetamine hydrochloride.

The Regional Trial Court convicted Dominguez, and the Court of Appeals affirmed. The appellate court held that Dominguez was caught in flagrante delicto and that the chain of custody was unbroken. Dominguez appealed to the Supreme Court.

The Issue: Was the Warrantless Seizure Valid?

The central question was whether the warrantless arrest and the resulting seizure of the sachet were lawful. Dominguez did not object to the illegality of his arrest before arraignment, so the Court ruled that he had waived any objection to the arrest itself. However, as the Court stressed in Homar v. People, that waiver does not carry with it a waiver of the inadmissibility of evidence seized during an illegal warrantless arrest.

The Court then examined whether the search fell under any recognized exception to the constitutional requirement of a warrant.

Why the Arrest Was Unlawful

For a warrantless arrest under Section 5(a), Rule 113 of the Rules of Court, two elements must concur: (1) the person arrested must have committed, be committing, or be attempting to commit an offense; and (2) the arresting officer must have personal knowledge of that fact.

Here, the officer testified that from a meter away, he merely saw Dominguez holding a small plastic sachet. He could not describe what the sachet contained — he only said it contained suspected shabu after he had already arrested Dominguez and confiscated the item.

The Court found that standing on a street and holding a plastic sachet cannot, by itself, be considered a criminal act. Citing People v. Villareal and Comerciante v. People, the Court noted that even with perfect vision, an officer cannot reasonably identify the contents of a tiny sachet from a distance. The officer’s suspicion, however genuine, was not enough to justify a warrantless arrest.

The Plain View Doctrine Did Not Apply

The Court also rejected the application of the plain view doctrine. For this doctrine to apply, three requisites must concur: (a) the officer has a prior justification for the intrusion; (b) the discovery is inadvertent; and (c) it is immediately apparent that the item is evidence of a crime.

While the officer’s presence was legitimate and the discovery was inadvertent, the third requisite failed. A very small plastic sachet is not readily apparent as contraband — it could contain just about anything. The fact that laboratory results later confirmed the substance was shabu does not cure the illegality of the seizure, because at the moment of seizure, it was not apparent that the sachet contained anything at all.

The Fruit of the Poisonous Tree

Because the warrantless search was not incidental to a lawful arrest and did not fall under the plain view doctrine, the seized sachet was deemed inadmissible under Section 3(2), Article III of the Constitution. As the corpus delicti of the crime charged, its exclusion meant the prosecution could not prove guilt beyond reasonable doubt. Dominguez was acquitted.

The Court also reminded trial courts to exercise extra vigilance in drug cases, noting that law enforcers have been known to resort to planting evidence or making false arrests.

Practical Takeaways

• A waiver of an illegal arrest does not waive the right to exclude illegally seized evidence. Accused persons should still challenge the admissibility of evidence at trial.
• Mere possession of a small sachet is not enough for a warrantless arrest. Police officers must have personal knowledge of an overt criminal act, not just suspicion.
• The plain view doctrine requires immediate apparentness. If an object’s incriminating nature is not clear at the moment of seizure, the seizure is unlawful.
• The chain of custody is not the only battleground. Even a perfect chain cannot save a case if the initial seizure was unconstitutional.
• For the defense, the timing of objections matters. Objections to an illegal arrest must be raised before arraignment, but evidentiary objections can be raised later.

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