Health and Safety Code Section 11837.1
11837.1. (a) In utilizing any program described in Section 11837, the court may require periodic reports concerning the performance of each person referred to and participating in a program. The program shall provide the court, the Department of Motor Vehicles, and the person participating in a program with an immediate report of any failure of the person to comply with the program's rules and policies.
(b) If, at any time after entry into or while participating in a program, a participant who is referred to an 18-month program described in Section 23542 of the Vehicle Code or a 30-month program described in Section 23548, 23552 , or 23568 of the Vehicle Code, fails to comply with the rules and policies of the program, and that fact is reported, the Department of Motor Vehicles shall suspend the privilege of that person to operate a motor vehicle for the period prescribed by law in accordance with Section 13352.5 of the Vehicle Code, except as otherwise provided in this section. The Department of Motor Vehicles shall notify the person of its action.
(c) If the department withdraws the license of a program, the department shall immediately notify the Department of Motor Vehicles of those persons who do not commence participation in a licensed program within 21 days from the date of the withdrawal of the license of the program in which the persons were previously participating. The Department of Motor Vehicles shall suspend or revoke, for the period prescribed by law, the privilege to operate a motor vehicle of each of those persons referred to an 18-month program pursuant to Section 23542 or 23562 of the Vehicle Code or to a 30-month program pursuant to Section 23548, 23552 , or 23568 of the Vehicle Code.