No Hearing Examiner shall communicate directly or indirectly about any material issue involved in a hearing with any party, except upon notice and opportunity for all parties to participate. This section does not prohibit a Hearing Examiner from communicating in any respect with other Bureau members or having the aid or advice of Bureau members, counsel or consultants retained by the Bureau who have not participated and will not participate in that hearing in an advocate capacity.
29- 250 C.M.R. ch. 2, § 13