12-180-12 Me. Code R. § 18
The Board may request any party to submit, at any time, a written statement of position, fact or law regarding any matter relevant to a pending prohibited practice complaint. Briefs requested or permitted by the presiding officer of an evidentiary hearing must be filed with the Board in accordance with the filing requirements of Chapter 10, section 7 on or before the date specified, and a copy must be simultaneously served on the other party or parties. Failure of a complainant to file a brief required by the presiding officer of an evidentiary hearing may be grounds for dismissal of the complaint. The failure of a respondent to file a brief required by the presiding officer of an evidentiary hearing may be grounds for entry of a default order against the respondent. An order dismissing a complaint or entering a default order resulting from a party's failure to file a brief must be with prejudice unless provided otherwise in the order.
12-180 C.M.R. ch. 12, § 18