California Code, Business and Professions Code - BPC § 7582.27

(a) Any person referred to in subdivision (i) of Section 7582.26 who uses or wears a baton or exposed firearm as authorized pursuant to this chapter shall wear a patch on each arm that reads “private security” and that includes the name of the company by which the person is employed or for which the person is a representative.  The patch shall be clearly visible at all times.  The patches of a private patrol operator licensee, or his or her employees or representatives shall be of a standard design approved by the director.

(b) The director may assess a fine of two hundred fifty dollars ($250) per violation of subdivision (a).