N.H. Rev. Stat. § 263:47
Every applicant or licensee shall be entitled to a hearing, before his application for a license or a renewal thereof is refused or his license is revoked, and shall be given due notice thereof. The sending of a notice of a hearing by registered mail to the last known address of a licensee or applicant 10 days prior to the date of the hearing shall be deemed due notice. The person deputized by the department to conduct a hearing shall have power to subpoena witnesses, administer oaths to witnesses and take testimony of any person or cause his deposition to be taken. A subpoena issued under the authority of this section shall be served in the same manner as a subpoena issued out of the superior court. Witnesses subpoenaed hereunder shall be entitled to the same fees and mileage as are allowed in civil actions in courts of record.
RSA 263:47
RSA 263-A:7. 1955, 208:1, par. 7. 1981, 146:1, eff. Jan. 1, 1982.