At any time prior to the issuance of the decision on the merits, the presiding officer, on the presiding officer's own initiative or on the motion of any participant, shall reopen the record to receive relevant, material, and non-duplicative testimony, evidence, or arguments not previously received, if the presiding officer determines that such testimony, evidence or arguments are necessary to a full and fair consideration of the issues to be decided.
N.H. Admin. Code § Plc 206.29