Unless otherwise provided, any party may take the testimony of any person, including a party, by deposition upon oral examination or written interrogatories for use as evidence in the proceeding. The deposition of a commissioner, the director, or the deputy director, may be taken only upon application to the presiding officer, for good cause shown and only in those circumstances where the statements or depositions of other staff members would not reveal the information, evidence, or details needed by the party for the case. The attendance of witnesses to a deposition may be compelled by use of subpoena. Depositions shall be taken only in accordance with this rule and the rules on subpoenas.