17-229-100 Me. Code R. § 08
All parties to the hearing shall be identified at the beginning of the hearing. Every party shall have the right to present evidence and arguments on the issues, to call witnesses and to participate in cross-examination.
If the presiding officer permits, any person may participate in a hearing by making oral or written statements of such person's position on the issues which may be presented during the hearing.
A member of the public, by written application may petition the presiding officer prior to the hearing and request to intervene in the proceedings. The presiding officer shall allow any person, department or corporation, showing that he is or may be, or is a member of a class which is or may be, substantially and directly affected by the proceeding to intervene as a party to the proceeding. Whenever intervenor status is denied,, the department shall include an entry to that effect and the reasons therefor.
Staff of the department may appear and participate in any adjudicatory proceeding.
17-229 C.M.R. ch. 100, § 08