G.R. No. 191069 ; November 15, 2010
PEOPLE OF THE PHILIPPINES, Plaintiff-Appellee, vs. SULPICIO SONNY BOY TAN y PHUA, Accused-Appellant.

FACTS

On February 20, 2006, police officers in Makati City, while on a manhunt operation, chanced upon accused-appellant Sulpicio Sonny Boy Tan y Phua. They overheard him offering “Valium 10, Cialis, Viagra” to two foreigners. Upon inquiry, he showed them the contents of his bag, which contained 120 tablets of Valium 10. He was immediately arrested, and the seized items were marked and inventoried at the police station. Forensic examination confirmed the tablets contained Diazepam, a dangerous drug. An Information was filed charging him with illegal possession of dangerous drugs under Section 11, Article II of Republic Act No. 9165 .
The accused-appellant interposed the defense of denial, claiming he was merely working as a parking attendant when he was arbitrarily apprehended and framed. The Regional Trial Court found him guilty, sentencing him to life imprisonment and a fine. The Court of Appeals affirmed the conviction but modified the fine. Accused-appellant appealed to the Supreme Court, arguing the prosecution failed to establish the chain of custody of the seized drugs and that his warrantless arrest and search were illegal.

ISSUE

The core issues are whether the warrantless arrest and search were valid and whether the prosecution established an unbroken chain of custody over the seized dangerous drugs.

RULING

The Supreme Court denied the appeal and affirmed the conviction. On the legality of the arrest, the Court ruled it was a valid warrantless arrest under Section 5(a), Rule 113 of the Rules of Court. The police officers personally witnessed accused-appellant in the act of selling and possessing Valium tablets, which they reasonably believed to be a dangerous drug. This constituted a crime committed in their presence, justifying immediate arrest and the consequent search incidental to a lawful arrest.
Regarding the chain of custody, the Court found the integrity and evidentiary value of the seized drugs were preserved. The prosecution presented sufficient evidence showing the seized items were immediately marked and inventoried by the apprehending officer at the police station, then forwarded to the forensic chemist for examination, which yielded a positive result for Diazepam. While the handling after the forensic examination was not meticulously detailed, the Court held that the established links—from seizure to laboratory analysis—were sufficient to prove the corpus delicti. Minor procedural lapses did not create reasonable doubt, as the evidence convincingly established all elements of illegal possession: that the accused was in possession of a prohibited drug, such possession was not authorized by law, and he freely and consciously possessed it.