N.H. Rev. Stat. § 179:59
The commission shall appoint liquor investigators whose primary function shall be the proper prosecution of this title. The liquor investigators shall have statewide jurisdiction, with reference to enforcement of all laws either in cooperation with, or independently of, the officers of any county or town. The commission shall have the primary responsibility for the enforcement of all liquor and beverage laws upon premises where liquor and beverages are lawfully sold, stored, distributed, or manufactured. Any person violating the provisions of any law may be prosecuted by the commission or any of its investigators as provided in this section, or by county or city attorneys, or by sheriffs or their deputies, or by police officials of towns.
RSA 179:59
1990, 255:1. 1995, 34:13, eff. June 23, 1995.