N.H. Rev. Stat. § 225-A:9-a
The validity or reasonableness of any rule adopted by the board may be judicially determined upon a petition to the superior court for declaratory judgment, brought within 30 days after the effective date of such rule. The court shall hear the petition and render a declaratory judgment only when it appears that the rule, or its threatened application, interferes with or impairs or threatens to interfere with or impair the legal rights and privileges of the petitioner. In rendering judgment the court shall give effect to any pertinent constitutional limitations upon the powers of the board, the limits of the authority and jurisdiction of the board as conferred under this chapter, and the procedural requirements of this chapter.
RSA 225-A:9-a
1988, 151:9, eff. June 20, 1988.