225 ILCS 25/27
At the time and place fixed in the notice under Section 25, the Board shall proceed to hear the charges and both the respondent and the complainant shall be accorded ample opportunity to present in person, or by counsel, such statements, testimony, evidence and argument as may be pertinent to the charges or to any defense thereto. The Board may continue such hearing from time to time.
The Board and Department shall have power to subpoena and bring before the Board any person in this State and to take testimony either orally or by deposition, or both, with the same fees and mileage and in the same manner as is prescribed by law for judicial procedure in civil cases.
The Secretary, the designated hearing officer, and any member of the Board shall have power to administer oaths at any hearing which the Department or Board is authorized by law to conduct.
225 ILCS 25/27