N.H. Rev. Stat. Ann. § 169-D:9-a

An officer may, with court approval, release a child to an alternative to secure detention as defined in RSA 169-B:2, pending the arrival of the parent, guardian, or custodian. The alternative program may release the child to the parent, guardian, or custodian upon their arrival. Any court, police, or juvenile probation and parole officer, acting in good faith pursuant to this section, shall have immunity from any liability, civil or criminal, which might otherwise be incurred or imposed as a result of release to an alternative to secure detention.