Each administrative body shall have the right to preserve order during the hearing and to take such steps, including the ejection of any disorderly or obstreperous person interfering with its proceedings as may be necessary, and the administrative body may, prior to any presentations and as a condition to the taking of testimony or information from any person, require the registration of all persons desiring to be heard during the hearing. It may restrict the testimony of any person to the material issues pending before it and, to prevent duplicative or cumulative presentation, it may impose reasonable time restrictions on any person. (Prior code § 1-7-8)