Section 48A.16 - Hearing on challenge - appeal1. At the time and place fixed for the hearing, the commissioner shall accept evidence on the challenge from the challenger and the challenged registrant, or from any person appearing on behalf of either, and review any documents or statements pertaining to the challenge received before the hearing. On the basis of the evidence submitted, the commissioner shall either reject the challenge or cancel the registration of the challenged registrant. Either the challenged registrant or the challenger may appeal the commissioner's decision to the district court in the commissioner's county, and the decision of the court shall be final.2. If a challenged registrant does not personally appear at the hearing and the challenged registrant's registration is canceled, the commissioner shall immediately notify the challenged registrant of the cancellation by first class forwardable mail sent to the challenged registrant's most recent mailing address according to the registration records.