California Code, Vehicle Code - VEH § 27158.5

After notice by a traffic officer that a motor vehicle does not comply with any standard adopted pursuant to Section 27157.5, no person shall operate, and no owner shall permit the operation of, such motor vehicle for more than 30 days thereafter unless a certificate of compliance has been issued for such vehicle in accordance with the provisions of Section 9889.18 of the Business and Professions Code or unless the department has checked the vehicle and determined that the vehicle has been made to comply with such standard adopted pursuant to Section 27157.5.  A certificate of compliance issued for such vehicle shall, for a period of one year from date of issue, constitute proof of compliance with the standards determined pursuant to Section 27157.5.