N.H. Rev. Stat. § 100-A:28
This retirement system and the provisions hereof shall not apply to any person benefited by or entitled to participate under any other provisions of law which provides wholly or in part at the expense of the state or any other employer, for retirement benefits for employees, teachers, permanent policemen, and permanent firemen employed by the state or such other employer, their widows or other dependents, with respect to the same period of service for which they are eligible for benefits under the terms of this chapter. The provisions of this section shall not apply to any person participating in, or receiving or eligible to receive benefits under the old-age and survivors insurance provisions of Title II of the federal Social Security Act, as amended or under a retirement arrangement federally tax-qualified under sections 403(b) or 457 of the United States Internal Revenue Code of 1986, as amended. The provisions of this section shall not apply with respect to the purchase of prior service credit under RSA 100-A:3, VI by any person who had participated in or deemed eligible to receive benefits under a retirement arrangement funded, wholly or in part, by contributions from a political subdivision of the state, or an agency or instrumentality of a political subdivision of the state; provided, that such arrangement shall first be terminated in full, but in no event later than December 31, 2005; and, further provided, that the benefits thereunder shall be distributed in their entirety to eligible participants and beneficiaries in accordance with the terms and conditions of such terminated retirement arrangement.
RSA 100-A:28
1967, 134:1. 2002, 146:3. 2004, 216:1, eff. July 1, 2004.