N.H. Rev. Stat. § 200:51
An employee of a school administrative unit, school, or chartered public school, or a 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 good faith conduct arising from or pertaining to the injury or death of a student-athlete provided the action or inaction was in compliance with this subdivision and local school board policies relative to the management of concussions and head injuries. This limitation of liability shall extend to school-sponsored athletic activities. A school district or school may provide concussion guidelines to other organizations sponsoring athletic activities on school property, however the school district or school shall not be required to enforce compliance with such guidelines.
RSA 200:51
2012, 234:2, eff. Aug. 17, 2012.