Background
D.J. Tosiuo’s convictions followed a high-speed drive through Dededo that ended when his white Volkswagen struck a concrete pole. After the vehicle was taken to the Dededo Precinct, a Guam Police Department officer saw a Smith & Wesson .357 Magnum revolver on the dashboard. Police seized the weapon, determined that Tosiuo did not hold a Firearm Identification Card, and found no registration record for the revolver. A jury later convicted him of possessing a firearm without an identification card and possessing an unregistered firearm, along with two motor-vehicle offenses.
The firearm was not working when police examined it. A GPD criminalist testified that its mainspring was broken, so the revolver was not in mechanical operating condition and could not be test-fired. He nevertheless identified it as a genuine revolver designed to expel a projectile through explosive force. He also testified that replacing the mainspring would restore it to full operating condition. Tosiuo moved for acquittal on the firearm counts, arguing that the People had to repair or fire the revolver to prove that it was “capable of discharging loaded ammunition.” The Superior Court denied the motion, and Tosiuo appealed the resulting judgment.
The Court’s Holding
The Supreme Court of Guam unanimously affirmed. Writing for the court, Chief Justice Robert J. Torres explained that the version of 10 GCA § 60100 in effect when Tosiuo committed the offenses did not impose a present-operability requirement. The statute defined a firearm by its explosive operating force and described a pistol or revolver as a firearm designed to be fired with one hand and capable of discharging loaded ammunition or noxious gas. In the court’s view, “capable” asks whether the object has the attributes needed to perform the function; it does not require that the weapon work at the precise moment it is possessed.
The statutory structure reinforced that conclusion. Guam law separately excludes devices not designed or redesigned as weapons and regulates firearm repair, distinctions that would make little sense if a repairable defect immediately removed a gun from the statutory definition. The court also relied on People v. Tennessen, which treated capability before or after repair as sufficient, and an earlier appellate decision holding that circumstantial evidence identifying an object as a service revolver could establish its firing capability. Federal and California decisions construing similar design-based language pointed in the same direction.
Applying that rule, the court held that the evidence was sufficient under the deferential standard governing a preserved challenge to the denial of acquittal. The criminalist identified the revolver, explained its original design, isolated the defect to a broken mainspring, and testified that replacing that part would restore full operation. The jury also saw the physical weapon. Although cross-examination established that the expert could not guarantee the revolver would fire without repairing and testing it, that testimony concerned confirmation of actual operation rather than the design-and-capability inquiry required by Guam law. A rational jury could therefore find beyond a reasonable doubt that the revolver remained a firearm.
Key Takeaways
- For offenses governed by the pre-2025 version of 10 GCA § 60100, the People need not prove that a firearm was operable at the moment of possession or introduce evidence of a successful test firing.
- A temporarily inoperable weapon may remain a firearm when the evidence shows it was designed to fire by explosive force and can be restored to operation through repair.
- Expert testimony identifying the weapon, its design, the specific defect, and the repair needed can provide sufficient proof; uncertainty about actual firing goes to evidentiary weight rather than creating an automatic legal failure.
Why It Matters
Tosiuo gives Guam prosecutors and defense counsel a concrete evidentiary rule for firearm-identification and registration cases involving damaged weapons. Prosecutors can establish the statutory element through design, appearance, expert identification, and repairability rather than repairing and test-firing every seized gun. Defense counsel, meanwhile, must address whether the object was genuinely designed as a weapon and whether restoration is realistic, rather than relying only on present mechanical failure.
The opinion is also a useful example of Guam’s territorial legal system developing its own statutory doctrine while consulting federal and state analogues. The Supreme Court of Guam exercised appellate jurisdiction under the Organic Act of Guam—the federal statute that functions as the territory’s constitutional framework—and Guam statutes, but grounded its merits ruling in local legislative text and Guam precedent. The court noted that the Legislature amended section 60100 in 2025 and expressly declined to decide how that amendment affects the current statute, leaving that question open for later cases.