Does a hearing examiner have a duty to reveal potential impeachment evidence to the accused attorney?

We have repeatedly declared that attorneys who are subject to disciplinary proceedings are not afforded all the procedural safeguards extended to criminal defendants. (Fitzsimmons v. State Bar (1983) 34 Cal.3d 327, 332, 193 Cal.Rptr. 896, 667 P.2d 700.) The question whether a particular rule of the civil or criminal law should be applied in disciplinary proceedings to assure fairness must be determined on the facts of each case. (Emslie v. State Bar (1974) 11 Cal.3d 210, 226, 113 Cal.Rptr. 175, 520 P.2d 991.) We have not previously considered whether the hearing examiner has a duty to reveal potential impeachment evidence to the accused attorney.