Officer uses taser, is charged with "Assault and Battery with a Dangerous Weapon"

An arbitrary line in the dirt makes all the difference.

...The brawl ended when one cop used his department-issued Taser to subdue the other. Joshua Wallar, who is a patrolman in neighboring New Hampshire, intervened in a domestic dispute between Massachusetts cop Daron Fraser and his pregnant girlfriend. As Fraser tried to drive away from the scene of the argument, Wallar apparently stopped his car, opened the door and shot the Taser at his chest. Waller was charged with assault and battery with a dangerous weapon because, as authorities pointed out, he is not authorized to use the Taser in Massachusetts. "He is not a police officer in Massachusetts," Haverhill Deputy Police Chief Donald Thompson told the Eagle Tribune. "He's a civilian."

[LINK]

Note: "Dangerous Weapon"