In Commonwealth v. Bouyer, a Massachusetts defendant appealed from convictions of possessing a loaded firearm, possessing ammunition without a firearm card, and carrying a firearm without a license to do so. The case arose at around 12:20 a.m. when three plainclothes police officers were patrolling in an unmarked cruiser. They saw 8-10 people leaving an alley, and one of the officers told the others that two people in the group were gang members.
When the group noticed the cruiser, they changed their behavior. The defendant started walking faster with his right arm held to his body, although his other arm was swinging. Based on their training, the officers suspected he was holding an illegal firearm. The officers got out of the cruiser without activating their sirens or lights and without saying anything to the individuals or drawing weapons. Two officers followed the defendant, who slipped into a building.
The door shut before the second officer got there, but once he opened the door he saw the first officer in a struggle with the defendant. The first officer told the second officer that the defendant had a firearm, and so the second officer helped to subdue the defendant and get hold of the firearm, which was at the defendant’s waist.