California Code, Vehicle Code - VEH § 31401

(a) The department shall adopt regulations designed to promote the safe operation of farm labor vehicles described in Section 322, including, but not limited to, vehicular design, equipment, passenger safety, and seating.

(b) The department shall inspect every farm labor vehicle described in Section 322 at least once annually to ascertain whether its construction, design, and equipment comply with all provisions of law. No person shall drive any farm labor vehicle described in Section 322 unless there is displayed therein a certificate issued by the department stating that on a stated day, which shall be within 13 months of the date of operation, an authorized employee of the department inspected the vehicle and found on the date of inspection the vehicle complied with applicable regulations relating to construction, design, and equipment. The commissioner shall provide by rule or regulation for the issuance and display of distinctive inspection certificates.

(c) The department may inspect any vehicle subject to these regulations in maintenance facilities, terminals, labor camps, or other private property of the vehicle owner or the farm labor contractor to insure compliance with the provisions of this code and regulations adopted pursuant to this section.

(d) The owner of any farm labor vehicle or any farm labor contractor, as defined in Section 1682 of the Labor Code, who rents a farm labor vehicle or who otherwise uses a farm labor vehicle to transport individuals is responsible for the inspection required under subdivision (b).

(e) An owner of any farm labor vehicle or any farm labor contractor who operates a farm labor vehicle under the circumstances described in subdivision (d) may not operate that vehicle unless the vehicle has a current certificate described in subdivision (b).

(f) It is unlawful to violate any provision of these regulations or this section.