N.H. Rev. Stat. Ann. § 9:22

RSA 9:20 and 9:21 shall not apply to members of boards or commissions who do not aid in, sanction, or assent to a violation thereof by other members of such boards or commissions, and who, when such violations come to their knowledge, shall indicate their dissent by entry thereof in the records of the respective board or commission or in the office of the secretary of state.