Moore, 20, originally attracted the attention of undercover officers, while they were holding an underage sting targeting minors trying to buy alcohol.
Witnesses say, Moore opened the trunk of his white Honda Civic while two undercover officers followed him, revealing what appeared to be military-grade weapons inside including a modified sniper rifle, a military knife, and a variety of guns.
The officer's immediately handcuffed Moore while they called in back-up. He was given a field sobriety test while bomb-arson investigators swept the car looking for possible explosives.
San Diego State Police, USD Police and CHP were also in the area and responded to the scene.
Moore was arrested for suspicion of DUI. He may also face charges for the weapons as well.
Investigators say if the incident had happened earlier in the day, while First Lady Michelle Obama was visiting San Diego, the law enforcement response would likely have been much more severe.