25 ILCS 150/4
The presiding officer of the Commission or any person designated by him, upon majority vote of the Commission, may administer oaths or affirmations and summon and compel the attendance before the Commission and examine under oath any person connected either directly or indirectly with any transaction with State agencies or any other person having information regarding the conditions, affairs, management, administration or methods involved in such financial transactions or fiscal matters. The Commission may similarly require any person having in his possession any records, books, papers, contracts or other documents pertinent to such matters or transactions to surrender the same or to otherwise afford the Commission access thereto.
Should any person fail to obey the summons or refuse to surrender or afford access, without reasonable cause, to any of the above mentioned papers, records, books, contracts or other documents, the Commission may apply to the Circuit Court of the County in which any operation of the fiscal matter or financial transaction took place, and such Court, if it finds that the Commission has not exceeded its authority, may, by order duly entered, require the attendance of witnesses and the production of relevant books and papers required by the Commission in carrying out the purposes of the Act. Upon refusal or neglect to obey the order of the Court, the Court may compel obedience of such order by proceedings for contempt.
25 ILCS 150/4