Hearings Before the Chief. In hearings before the Chief, the provisions of §A(2) and (3) of this regulation apply. Each party is entitled, on a genuine issue in a contested case, to: Call witnesses; Offer evidence; and Cross-examine any witness who testifies. Exclusion of Witnesses. Upon request by a party, the Chief shall exclude witnesses other than parties from the hearing room, except when testifying. A party that is not an individual may designate an employee or officer as its representative to remain in the hearing room, even though the employee or officer may be a witness. An expert witness who is to render an opinion based on testimony given at the hearing may remain during that testimony. A party, representative, witness, or spectator may not disclose to a witness excluded under §A(3) of this regulation the nature, substance, or purpose of testimony, or other evidence introduced during that witness's absence. The Chief may: Exclude the testimony of a witness who receives information in violation of §A(3) of this regulation; or Take other appropriate action. COMAR 28.02.01.20 governs hearings delegated to the Office.