California Code, Vehicle Code - VEH § 34689

The department shall periodically, but not less frequently than quarterly, transmit to the Department of the California Highway Patrol a list of persons, firms, and corporations that have received a carrier identification number from the Department of the California Highway Patrol, but that have not registered with the department. The Department of the California Highway Patrol may use this list in its normal enforcement activities, including terminal inspections and roadside enforcement, as prima facie evidence of a failure to register.