G.R. No. 189844 ; November 15, 2010
PEOPLE OF THE PHILIPPINES, Plaintiff-Appellee, vs. MARIO VILLANUEVA BAGA, Accused-Appellant.

FACTS

The prosecution’s case stemmed from a buy-bust operation on July 22, 2002, in Quezon City. Based on a tip, a police team was formed with PO2 Florante Manlapig as the poseur-buyer. The team proceeded to the target area where the informant introduced PO2 Manlapig to accused-appellant Mario Baga. PO2 Manlapig testified that he handed marked money to Baga, who in turn gave him a plastic sachet containing suspected shabu. Upon examination, PO2 Manlapig gave the pre-arranged signal, leading to Baga’s arrest. The seized item was marked at the police station and later confirmed by forensic examination to be 0.04 gram of Methylamphetamine Hydrochloride.
The defense presented a starkly different version. Accused-appellant Baga denied the sale, claiming he was merely accosted by two men in civilian clothes while on his way to return rented VCDs. He was brought to the police station without explanation and was later informed of the drug charges. The Regional Trial Court found Baga guilty of violating Section 5 of Republic Act No. 9165 and sentenced him to life imprisonment and a fine. The Court of Appeals affirmed this conviction.

ISSUE

Whether the prosecution proved the guilt of the accused-appellant for illegal sale of dangerous drugs beyond reasonable doubt.

RULING

The Supreme Court REVERSED the appellate court’s decision and ACQUITTED accused-appellant Mario Baga. The Court emphasized that in prosecutions for illegal sale of dangerous drugs, the identity of the drug must be established with moral certainty, and the chain of custody rule must be strictly observed to ensure the integrity and evidentiary value of the seized item. The Court found critical gaps in the prosecution’s evidence regarding the chain of custody.
The legal logic centers on the failure to establish an unbroken chain. PO2 Manlapig, the poseur-buyer, testified that after the arrest and while en route to the police station, he took custody of the seized sachet. However, SPO1 Wilfredo Hidalgo, a back-up officer, testified that he was the one who had possession of the sachet from the scene of the arrest until they reached the station. This material inconsistency on who had initial custody—a vital first link in the chain—created reasonable doubt about the integrity of the evidence allegedly seized from Baga. The prosecution did not reconcile these contradictory testimonies. Without a credible account of who handled the drug immediately after seizure, the possibility of alteration, substitution, or contamination could not be ruled out. Consequently, the identity and integrity of the corpus delicti were compromised. The presumption of innocence prevails when the prosecution fails to overcome reasonable doubt, which in this case was generated by the broken chain of custody.