State law permits the use of corporal punishment for disciplinary purposes.
New Hampshire Revised Statutes Annotated 627:6. Physical Force by Persons with Special Responsibilities.
II. (a) A teacher or person otherwise entrusted with the care or supervision of a minor for special purposes is justified on the premises in using necessary force against any such minor, when the minor creates a disturbance, or refuses to leave the premises or when it is necessary for the maintenance of discipline.