(a) It is improper that there be any ex parte, private, oral or written communications on the merits of a pending application to the commissioner, assistant commissioners, administrative adviser, or to the hearing officer in the case, by any person, either in private or public life, unless requested by them or otherwise required by law.

(b) It is improper that there be any effort, direct or indirect, by any person to sway the judgment of the commissioner, assistant commissioners, administrative adviser, or hearing officer by attempting to bring pressure or influence to bear upon them.