G.R. No. 168695 - People vs. Lagman

The National Bureau of Investigation (NBI) received reports about clandestine shabu laboratories operating in Pampanga.
In January 1996, the NBI conducted surveillance on a piggery farm in Porac, Pampanga, suspected of being used as a front for shabu manufacture.
They observed three Chinese nationals—Zeng Wa Shui (Zeng), Li Wien Shien (Li), and Jojo Gan (Gan)—occupying the farm, and Maribel Lagman (Maribel) frequently visiting the premises.
Zeng and Li were seen visiting Maribel’s rented house in Angeles City, which she shared with her Chinese common-law husband, Jose “Bobby” Yu.

Two simultaneous raids were conducted by NBI teams on March 14, 1996: one at the Porac piggery farm and another at Maribel’s Balibago residence, under search warrants Nos. 96-102 and 96-101, respectively.
At the Porac farm:

No persons were found inside the farm during search, only pigs and two drums containing acetone and ethyl, confirmed by field test.
NBI operatives secured the premises and waited for suspected operators.
At around 10 a.m., Li arrived in a blue Toyota Corolla sedan; inside, a digital weighing scale and 317.60 grams of crystalline substance tested positive as shabu were found.
Around noon, Zeng arrived in a Mitsubishi L-300 van carrying a blue drum containing liquid which field-tests also identified as shabu.

Maribel was fetched from work since she was not home during the raid.
Two padlocked rooms were forcibly opened; inside were 18 big plastic containers of liquid, 30 sacks, and 10 plastic containers with white powdery substances, plastic gallons, refrigerator, blower, and a .25 caliber handgun.
Six of the containers tested positive for shabu; the sacks contained ephedrine hydrochloride; other chemicals (alcohol solvents, sodium hydroxide) were identified as shabu precursors.

Possession of 527 kilograms of methamphetamine hydrochloride (shabu) in liquid form (Criminal Case No. 96-377).
Possession of 1,615 kilograms of ephedrine hydrochloride, a controlled precursor (Criminal Case No. 96-378).

Li was indicted for possession of 317.60 grams of methamphetamine hydrochloride found in his vehicle (Criminal Case No. 96-379).
Zeng was indicted for possession of 78 kilograms of methamphetamine hydrochloride found in his van (Criminal Case No. 96-380).
The cases were consolidated before RTC Angeles City Branch 59.

Maribel denied knowledge of the contents of the padlocked rooms, claiming they belonged to Yu who frequently absented himself and who managed the premises. She admitted Zeng visited her but denied knowledge of illegal activities.
Li denied involvement and knowledge of the alleged shabu laboratory operations, claiming he only bought piglets.
Zeng denied knowing Maribel or Li and claimed limited visits to the farm as a potential piggery manager.
Trial court acquitted Li but convicted Maribel and Zeng, sentencing them to death and imposing fines (P2,000,000 on Maribel and P1,000,000 on Zeng).

Maribel and Zeng appealed to the Court of Appeals, raising issues on evidentiary admissibility and lack of proof of possession or authority over the seized substances.
The Court of Appeals affirmed the RTC’s conviction and sentence.
Maribel and Zeng elevated the case to the Supreme Court.

Whether Search Warrant No. 96-101 was valid despite not specifically identifying Maribel by name.
Whether Maribel had constructive possession and knowledge of the illegal drugs and paraphernalia found in her rented house.
Whether the seizure of the blue drum of shabu from Zeng’s van, which was not mentioned in Search Warrant No. 96-102, was lawful and admissible.
Whether the prosecution sufficiently proved that Zeng had no license or authority to possess the methamphetamine hydrochloride.
Whether failure to conduct quantitative tests on the seized shabu affects the weight of the evidence or the penalty imposed.