(a) Investigational hearings, as distinguished from hearings in adjudicative proceedings, may be conducted pursuant to a civil investigative demand for the giving of oral testimony in the course of any Bureau investigation, including inquiries initiated for the purpose of determining whether or not a respondent is complying with an order of the Bureau.

(b) Investigational hearings shall be conducted by any Bureau investigator for the purpose of hearing the testimony of witnesses and receiving documentary material, tangible things, or other information relating to any subject under investigation. Such hearings shall be under oath or affirmation and stenographically reported, and a transcript thereof shall be made a part of the record of the investigation. The Bureau investigator conducting the investigational hearing also may direct that the testimony be recorded by audio, audiovisual, or other means, in which case the recording shall be made a part of the record of the investigation as well.

(c) In investigational hearings, the Bureau investigators shall exclude from the hearing room all persons except the person being examined, his or her counsel, the officer before whom the testimony is to be taken, any investigator or representative of an agency with which the Bureau is engaged in a joint investigation, and any individual transcribing or recording such testimony. At the discretion of the Bureau investigator, and with the consent of the person being examined, persons other than those listed in this paragraph may be present in the hearing room. The Bureau investigator shall certify or direct the individual transcribing the testimony to certify on the transcript that the witness was duly sworn and that the transcript is a true record of the testimony given by the witness. A copy of the transcript shall be forwarded promptly by the Bureau investigator to the custodian designated in section 1080.13.