Mass. Gen. Laws ch. 13, § 9B
(a) A public member or a lay member of any board shall not be, nor shall he have been within the period of five years immediately preceding his appointment, any of the following:
(c) If any board shall as a part of its functions delegate any duty or responsibility to be performed by a single member of such board, such delegation shall not be made solely to any public member or any lay member of the board in any of the following instances: