N.H. Rev. Stat. § 227-G:8
Forest rangers and officials of the division appointed to enforce this title and other laws provided for in RSA 227-G:7 are authorized, upon successful completion of the preparatory training programs for full-time or part-time police officers established by the police standards and training council under RSA 106-L and their subsequent certification as full-time or part-time police officers, to prosecute these laws within the jurisdiction of municipal and district courts, unless the prosecutorial jurisdiction over a particular case or class of cases is preempted by the county attorney or the attorney general. Prosecutions for violations of any provisions of this title are declared to be valid and proper, notwithstanding the existence of any law of this state dealing with matters that may be the same as or similar to those covered by this title.
RSA 227-G:8
1995, 299:1. 2007, 88 : 4 , eff. Aug. 10, 2007. 2017, 206 : 13 , eff. Sept. 8, 2017.