Ill. Admin. Code tit. 56, § 200.260
d) The provisions of this Act do not apply to:
e) If an employee works for a State Agency and is covered by a bona fide collective bargaining agreement in effect on July 1, 2024, then nothing in the Act shall affect the validity or change the terms of the agreement applying to the employee. Employees covered under a bona fide collective bargaining agreement with a State Agency may only waive the requirements of the Act in such agreement under the following conditions: