G.R. No. 160384 - Hilario vs. Salvador

Accused-appellant Paterno Lorenzo y Casas was charged with violating Sections 5 and 11, Article II of Republic Act No. 9165 (Dangerous Drugs Act of 2002) for illegal selling and possession of dangerous drugs.
The charges arose from a buy-bust operation conducted on 9–10 September 2003 in the Municipality of San Mateo, Rizal, following reports relayed by a confidential informant regarding Lorenzo’s alleged drug peddling activities.
Multiple criminal cases were instituted:

Criminal Case No. 6992 charged him with illegal possession of 2.04 grams of shabu.
Criminal Case No. 6993 charged him with the illegal sale of 0.20 gram of shabu.
A separate Information involving Conrado Estanislao y Javier (co-accused) was consolidated, though he was later acquitted.

Police officers, including PO1 Noel P. Pineda and his team, executed the operation based on information from a confidential informant.
The officers prepared marked P100 bills for the buy-bust, coordinated surveillance, and converged on the suspect’s location as reported.
At approximately 1:00 a.m. on 10 September 2003, the police arrested Lorenzo when he was seen negotiating with a poseur-buyer.
During the arrest, a body search yielded the marked money and plastic sachets containing the white crystalline substance, which later tested positive for methylamphetamine hydrochloride (shabu).

During the joint trial on the consolidated cases, the prosecution presented PO1 Pineda as its sole witness, detailing the sequence of events during the buy-bust operation.
Both Lorenzo and Estanislao pleaded “not guilty” and presented defenses centered on denial and claims of a frame-up.
The Regional Trial Court (RTC) of San Mateo, Rizal, rendered its decision on 5 October 2005:

Paterno Lorenzo y Casas was convicted beyond reasonable doubt for the crime of illegal sale (Criminal Case No. 6993) and illegal possession (Criminal Case No. 6992) of dangerous drugs.
Conrado Estanislao y Javier was acquitted for lack of proof of his guilt.
The evidentiary basis of the conviction included the marked currency, the recovery of the drug sachets, and the police testimonies, which were later scrutinized regarding the procedures followed.

On 14 June 2007, the Court of Appeals affirmed the RTC’s decision, upholding the conviction based on the regularity of official functions performed by police officers during the buy-bust operation.
Accused-appellant Lorenzo appealed to the Supreme Court, arguing that:

The trial court and the CA erred in convicting him for violations of RA 9165.
There were significant lapses in the procedures concerning the seizure, custody, and chain of evidence—specifically, the failure to inventory and photograph the confiscated drugs as required under Section 21, Article II of RA 9165 and its Implementing Rules and Regulations (IRR).

The prosecution admitted that procedural lapses occurred, notably the non-compliance with the required inventory and photographic documentation of the confiscated drug sachets.
Testimonies revealed uncertainties regarding:

These procedural deficiencies raised serious doubts as to whether the drugs examined in the laboratory were indeed those confiscated from Lorenzo, thus calling into question the integrity of the corpus delicti.

Whether the Court of Appeals erred in affirming the conviction of Paterno Lorenzo y Casas for violations of Sections 5 and 11 of RA 9165.
Whether the failure to comply with the mandated procedures (inventory and photographing) for the seizure and custody of dangerous drugs undermined the evidentiary chain and rendered the prosecution’s case insufficient to establish the identity of the corpus delicti beyond reasonable doubt.
Whether the inconsistencies in the evidence handling—particularly the uncertainties regarding the chain of custody—precluded the establishing of all requisite elements of the crimes charged (illegal sale and possession).