California Code, Vehicle Code - VEH § 12519

(a) No person shall operate a farm labor vehicle unless the person has in his or her possession a driver's license for the appropriate class of vehicle to be driven, endorsed for passenger transportation, and, when transporting one or more farmworker passengers, a certificate issued by the department to permit the operation of farm labor vehicles.

(b) The applicants shall present evidence that they have successfully completed the driver training course developed by the Department of Education pursuant to Section 40081 of the Education Code, and approved by the Department of Motor Vehicles and the Department of the California Highway Patrol before a permanent certificate will be issued.

(c) The certificate shall be issued only to applicants qualified by examinations prescribed by the Department of Motor Vehicles and the Department of the California Highway Patrol and upon payment of a fee of twelve dollars ($12) to the Department of the California Highway Patrol.  The examinations shall be conducted by the Department of the California Highway Patrol.

(d) A person holding a valid certificate to permit the operation of a farm labor vehicle, issued prior to January 1, 1991, shall not be required to reapply for a certificate to satisfy any additional requirements imposed by the act adding this subdivision until the certificate he or she holds expires or is canceled or revoked.