No party or other person(s) legally interested in the outcome of a hearing may communicate ex parte either directly or indirectly with the Board assigned to the case in connection with any issue of fact, law or procedure except upon notice and opportunity for all parties to participate. Discussions between each party and its respective partisan Board member during conciliation or attempted conciliation, prior to convening the hearing in an arbitration case, or such dialogue during interest fact-finding do not constitute prohibited ex parte communications within the meaning and intent of this rule.
12-186 C.M.R. ch. 1, § 17