Vehicle Code § 2261

A uniform substantially similar to the official uniform of members of the California Highway Patrol shall not be worn by any other law enforcement officer or by any other person except duly appointed members of the California Highway Patrol and persons authorized by the commissioner to wear such uniform in connection with a program of entertainment. A uniform shall be deemed substantially similar to the uniform of the California Highway Patrol if it so resembles such official uniform as to cause an ordinary reasonable person to believe that the person wearing the uniform is a member of the California Highway Patrol.