RSA 491:19: Petition.

Whenever any official or board is given the power to summon witnesses and take testimony, but not the power to punish for contempt, and any witness refuses to obey such summons, either as to his appearance or as to the production of things specified in the summons, or refuses to testify or to answer any questions, a petition for an order to compel him to testify or to comply with the summons may be filed in the superior court, or with some justice thereof.