The purpose of the hearing is to receive factual evidence and expert opinion testimony related to the issues in the proceeding. Argument will not be received in evidence; rather, it should be presented in statements, memoranda, or briefs, as determined by the presiding officer. Brief opening statements, which shall be limited to statement of the party's position and what the party intends to prove, may be made at hearings.
45 C.F.R. § 99.24