N.H. Rev. Stat. Ann. § 622:50

The superior court may, with notice to the attorney general and to the county attorney, if any, who prosecuted the case and after a hearing, for due cause shown, parole any person committed to the unit by criminal proceedings upon such terms and conditions as justice may require; and said court may at any time thereafter, for due cause shown, revoke said parole and order said person returned to the unit under the original commitment.