A person who acts as a security guard may, while he is in the performance of his duties in that capacity, carry a loaded weapon in a motor vehicle which is being used to provide armored car service or which is otherwise transporting things of value, provided that any weapon carried is not concealed.
Firearms
32 M.R.S. § 9416, under PRIVATE SECURITY GUARDS.
32 M.R.S. § 9416