California Code, Health and Safety Code - HSC § 11839.14

For purposes of this article, a conviction means a plea or verdict of guilty or a conviction following a plea of nolo contendere. Any action that the department is permitted to take following the establishment of a conviction may be taken 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, notwithstanding a subsequent order pursuant to Section 1203.4 or 1203.4a of the Penal Code permitting the 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, information, or indictment. For purposes of this article, the record of conviction, or a certified copy thereof, shall be conclusive evidence of the conviction.