N.H. Rev. Stat. Ann. § 126-U:5-c

Notwithstanding any other provision of this chapter, the youth development center may confine children in their rooms when such confinement is part of a routine practice applicable to substantial portions of the population at the center and not imposed as a consequence in response to the behavior of one or more children. Such confinement is not subject to the notice and reporting requirements of RSA 126-U:7.