G.R. No. 110778 August 4, 1994
PEOPLE OF THE PHILIPPINES, plaintiff-appellee, vs. ALEJANDRO MENDIOLA Y DE LA CRUZ, accused-appellant.

FACTS

The prosecution’s case, as synthesized by the trial court, alleged that on August 26, 1992, in Quezon City, PO2 Rodelio Recto acted as a poseur-buyer in a buy-bust operation. Using code words, he allegedly bought a packet of methamphetamine hydrochloride (shabu) from accused-appellant Alejandro Mendiola for P700.00. Upon receiving the marked money, Mendiola was apprehended, and a small plastic packet with white crystalline substance was allegedly recovered from his hand. Forensic examination confirmed the substance was shabu. The trial court convicted Mendiola of violating the Dangerous Drugs Act and sentenced him to life imprisonment and a fine.
The defense presented a starkly different version. Mendiola claimed he was at his house tending to his pigs and was later invited by an acquaintance, Danding Coronel, to act as a “Kristo” in a cockfight. On the way, they passed by a police station where Coronel went inside. Coronel later exited, left to buy cigarettes, and never returned. Mendiola was then prevented from leaving by a policeman who told him he was a “palit ulo” (replacement) for Coronel. He was subsequently detained and falsely charged.

ISSUE

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

RULING

The Supreme Court REVERSED the conviction and ACQUITTED accused-appellant. The legal logic centered on the prosecution’s fatal failure to establish the corpus delicti—the identity of the prohibited drug—with the required moral certainty. In drug prosecutions, the existence and identity of the dangerous drug are indispensable elements of the crime. The Court found the evidence on this point “demonstrably weak, unreliable, and unconvincing.”
Critical to this conclusion was the prosecution’s failure in the chain of custody. PO2 Recto, the poseur-buyer, admitted he did not place any identifying mark on the plastic packet he allegedly seized. The investigator, Sotero Basilio, could not positively identify the shabu (Exhibit G) presented in court as the very item seized. Basilio merely testified it was “similar” to the evidence presented to him. The Court held that mere similarity is grossly insufficient; unwavering exactitude in identifying the corpus delicti is necessary to meet the standard of proof beyond reasonable doubt. This deficiency created reasonable doubt as to whether the substance presented in court was the same one allegedly sold by Mendiola. Consequently, the constitutional presumption of innocence was not overcome. Given this fundamental failure, the Court found it unnecessary to delve into the assigned errors regarding the credibility of the buy-bust operation versus frame-up. The alibi presented by the defense, corroborated by unrelated witnesses, was noted to have assumed significance due to the prosecution’s weak evidence.