N.H. Rev. Stat. Ann. § 621:17

The department may receive and maintain juvenile offenders sent to the center by virtue of any act of the Congress of the United States for such reasonable compensation as may be agreed upon with the United States authorities. The commissioner shall receive, detain, and treat these offenders as if they had been detained or committed by a juvenile proceeding in a New Hampshire court, except that no such juvenile shall be released to parole or furlough without approval of the United States authorities.