The Authority may designate such staff members as it deems necessary to aid in the conduct of the examinations and investigations. Questioning of witnesses at a hearing shall be limited to members of the Authority, members of the staff of the Authority, and such other persons as may be permitted to do so by the presiding member.
12 Pa. Code § 81.208
This section cited in 12 Pa. Code § 81.221 (relating to issuing subpoenas).