Section 25850 does not apply to any armored vehicle guard, as defined in Section 7582.1 of the Business and Professions Code, if either of the following conditions is satisfied:
(a) The guard was hired prior to January 1, 1977, and is acting within the course and scope of employment.
(b) The guard was hired on or after January 1, 1977, has received a firearms qualification card from the Department of Consumer Affairs, and is acting within the course and scope of employment.