§ 81.22 Amici curiae.

(a) Any interested person or organization may file a petition to participate in a proceeding as an amicus curiae. Such petition shall be filed prior to the prehearing conference, or if none is held, before the commencement of the hearing, unless the petitioner shows good cause for filing the petition later. The presiding officer may grant the petition if he finds that the petitioner has a legitimate interest in the proceedings, that such participation will not unduly delay the outcome, and may contribute materially to the proper disposition thereof. An amicus curiae is not a party and may not introduce evidence at a hearing.