California Code, Business and Professions Code - BPC § 2237

(a) The conviction of a charge of violating any federal statutes or regulations or any statute or regulation of this state, regulating dangerous drugs or controlled substances, constitutes unprofessional conduct. The record of the conviction is conclusive evidence of such unprofessional conduct. A plea or verdict of guilty or a conviction following a plea of nolo contendere is deemed to be a conviction within the meaning of this section.

(b) Discipline may be ordered in accordance with Section 2227 or the Division of Licensing may order the denial of the license when the time for appeal has elapsed, or the judgment of conviction has been affirmed on appeal, or when an order granting probation is made suspending the imposition of sentence, irrespective of a subsequent order under the provisions of Section 1203.4 of the Penal Code allowing such person to withdraw his or her plea of guilty and to enter a plea of not guilty, or setting aside the verdict of guilty, or dismissing the accusation, complaint, information, or indictment.