Business and Professions Code section 5109

The expiration, cancellation, forfeiture, or suspension of a license, practice privilege, or other authority to practice public accountancy by operation of law or by order or decision of the board or a court of law, the placement of a license on a retired status, or the voluntary surrender of a license by a licensee shall not deprive the board of jurisdiction to commence or proceed with any investigation of or action or disciplinary proceeding against the licensee, or to render a decision suspending or revoking the license.