N.H. Rev. Stat. Ann. § 433-A:8

The commissioner is authorized to revoke registrations of any person or to refuse to register horticultural growing media upon satisfactory evidence that the registrant or person has used fraudulent or deceptive practices in the evasion or attempted evasion of the provisions of this chapter or of any rules adopted under this chapter. No registration shall be revoked or denied until the registrant or person has been notified by certified mail, return receipt requested, of the time and place of the hearing and has been given an opportunity to appear and be heard by the commissioner or an authorized representative.