RCW 18.170.050: Armed private security guard license authority—Registration of firearms.

(1) An armed private security guard license grants authority to the holder, while in the performance of his or her duties, to carry a firearm with which the holder has met the proficiency requirements established by the commission.

(2) All firearms carried by armed private security guards in the performance of their duties must be owned or leased by the employer and, if required by law, must be registered with the proper government agency.