N.H. Rev. Stat. § 595-B:5
An inspection, testing or sampling pursuant to a warrant issued under this chapter shall not be made between 6:00 p.m. of any day and 8:00 a.m. of the succeeding day, unless specifically authorized by the person issuing such warrant upon a showing that such authority is reasonably necessary to effectuate the purpose of the law, rule, code, ordinance, or regulation being enforced. An inspection pursuant to a warrant shall not be made by means of forcible entry, except that the person issuing such warrant may expressly authorize a forcible entry when facts are shown sufficient to suggest a probable violation of a state law or rule, or municipal ordinance, code, or regulation, which, if such violation existed, would present an immediate threat to public health or safety, or when facts are shown which establish that reasonable attempts to serve a previous warrant have been unsuccessful. Notwithstanding any law to the contrary, an official or employee of a state agency, municipality, or other political subdivision executing an inspection warrant may be accompanied by suitable assistants, including a sheriff or his deputy, any state police officer, or any constable or police officer of any city or town.
RSA 595-B:5
1981, 533:1. 1987, 342:3. 1991, 231:10, eff. Aug. 9, 1991.