N.H. Rev. Stat. Ann. § 193-J:3

Nothing in this chapter shall create a private right of action against any school administrative unit, school district, public academy, chartered public school, the state, or any employee, contractor, subcontractor, or agent thereof. A school administrative unit employee, school employee, chartered public school employee, public academy employee, regular school volunteer, pupil, parent, legal guardian, or employee of a company under contract to a school, school district, school administrative unit, or chartered public school, shall be immune from civil liability for conduct arising from or related to the implementation of, or failure to adequately implement, this chapter.