Veh. Code, § 23514

(a) If a person is found to be in violation of Section 23140, is convicted of, or is adjudged a ward of the juvenile court for, a violation of Section 21200.5, 23140, or 23152 punishable under Section 23536, or Section 23220, 23221, or 23222, subdivision (a) or (b) of Section 23224, or Section 23225 or 23226, and is granted probation, the court may order, with the consent of the defendant or ward, as a term and condition of probation in addition to any other term and condition required or authorized by law, that the defendant or ward participate in the program.

(b) The court shall give preference for participation in the program to defendants or wards who were less than 21 years of age at the time of the offense if the facilities of the program in the jurisdiction are limited to fewer than the number of defendants or wards eligible and consenting to participate.

(c) The court shall require that the defendant or ward not drink any alcoholic beverage at all before reaching the age of 21 years and not use illegal drugs.