No exchange of tickets shall be made except at the box office, and no ticket shall be redeemed after the show has taken place. Tickets in the hands of agencies shall be returned to the box office not later than one hour after the show has started.
Cal. Code Regs. Tit. 4, § 271
Note: Authority cited: Section 18611, Business and Professions Code. Reference: Sections 18640 and 18824, Business and Professions Code.