505 ILCS 90/22.03
The Department is authorized to hold administrative hearings to determine violations of the Act and compliance with provisions of this Act. All administrative decisions are subject to and hearings shall be conducted in accordance with the provisions of this Act and the Illinois Administrative Procedure Act.
At the time and place fixed in the hearing notice, the Department shall proceed to hear the matter and any charges made and both the respondent and any 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 matter or charges or to any defense thereto. The Department may continue such hearing from time to time.
The Department, over the signature of the Director, is authorized to issue subpoenas and to bring before the Department any person or persons in this State and to take testimony either orally or by deposition or by exhibit with the same fees and mileage and in the same manner as prescribed by law in judicial proceedings and civil cases in the circuit courts of this State. The Director is authorized to issue subpoenas duces tecum on any or all records relating to a nursery or nursery dealer's business. The director may administer oaths to witnesses at any hearing which the Department is authorized by law to conduct.
505 ILCS 90/22.03