(a) Amendments. The notice or answer may be amended or supplemented at any stage of the proceeding. The respondent must answer an amended notice within the time remaining for the respondent's answer to the original notice, or within 10 days after service of the amended notice, whichever period is longer, unless the Director or presiding officer orders otherwise for good cause shown.

(b) Amendments to conform to the evidence. When issues not raised in the notice or answer are tried at the hearing by express or implied consent of the parties, or as the presiding officer may allow for good cause shown, such issues will be treated in all respects as if they had been raised in the notice or answer, and no formal amendments are required. If evidence is objected to at the hearing on the ground that it is not within the issues raised by the notice or answer, the presiding officer may admit the evidence when admission is likely to assist in adjudicating the merits of the action. The presiding officer will do so freely when the determination of the merits of the action is served thereby and the objecting party fails to satisfy the presiding officer that the admission of such evidence would unfairly prejudice that party's action or defense upon the merits. The presiding officer may grant a continuance to enable the objecting party to meet such evidence.