N.H. Rev. Stat. Ann. § 282-A:174

The legislature reserves the right to amend or repeal all or any part of this chapter at any time; and there shall be no vested private right of any kind against such amendment or repeal. All the rights, privileges, or immunities conferred by this chapter or by acts done pursuant thereto shall exist subject to the power of the legislature to amend or repeal this chapter at any time.