805 ILCS 10/15.5
All information collected by the regulating authority in the course of an examination or investigation of a holder of a certificate of registration or an applicant, including, but not limited to, any complaint against a holder of a certificate of registration filed with the regulating authority and information collected to investigate any such complaint, shall be maintained for the confidential use of the regulating authority and shall not be disclosed. The regulating authority may not disclose the information to anyone other than law enforcement officials, other regulatory agencies that have an appropriate regulatory interest as determined by the regulating authority, or a party presenting a lawful subpoena to the regulating authority. Information and documents disclosed to a federal, State, county, or local law enforcement agency shall not be disclosed by the agency for any purpose to any other agency or person. A formal complaint filed against a holder of a certificate of registration or an applicant shall be a public record, except as otherwise prohibited by law.
805 ILCS 10/15.5