Cal. Business and Professions Code § 2951

(a) The use of any controlled substance or the use of any of the dangerous drugs specified in Section 4022, or of alcoholic beverages, to the extent, or in such a manner as to be dangerous or injurious to the registrant, or to any other person or to the public, or to the extent that this use impairs the ability of the registrant to practice safely or more than one misdemeanor or any felony conviction involving the use, consumption, or self-administration of any of the substances referred to in this section, or any combination thereof, constitutes unprofessional conduct. The record of the conviction is conclusive evidence of this unprofessional conduct. (b) 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. The board may order discipline of the registrant in accordance with Article 4 (commencing with Section 2960) or may order the denial of the registration 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 imposition of sentence, irrespective of a subsequent order under the provisions of Section 1203.4 of the Penal Code allowing this person to withdraw their 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.