California Code, Government Code - GOV § 19850.2

(a) The uniform is clearly necessary for ready visual identification by the public for law enforcement, public safety, or other closely related purposes; and

(b) The employee is required by his or her appointing power to wear the uniform for the regular performance of his or her duties; and

(c) The uniform is authorized for wear only in an official capacity.

If the provisions of this section are in conflict with the provisions of a memorandum of understanding reached pursuant to Section 3517.5, the memorandum of understanding shall be controlling without further legislative action, except that if the provisions of a memorandum of understanding require the expenditure of funds, the provisions shall not become effective unless approved by the Legislature in the annual Budget Act.