Whenever a witness, upon being ordered by a superior court justice to recognize, neglects or refuses to do so, the justice may issue a warrant and cause such witness to be committed to jail until he complies with the order.
N.H. Rev. Stat. Ann. § 597:23
Commitment in Default of Recognizance
Source
Official source: New Hampshire General Court. Reproduced from public-domain New Hampshire statutes; confirm against the official source for the current text. Not legal advice.