730 ILCS 140/3
After the effective date of this Act, the State, any unit of local government, or a county sheriff, shall not contract with a private contractor or private vendor for the provision of services relating to the operation of a correctional facility or the incarceration of persons in the custody of the Department of Corrections, the Department of Juvenile Justice, or a sheriff; however, this Act does not apply to (1) State work release centers or juvenile residential facilities that provide separate care or special treatment operated in whole or part by private contractors or (2) contracts for ancillary services, including medical services, educational services, repair and maintenance contracts, or other services not directly related to the ownership, management or operation of security services in a correctional facility.
730 ILCS 140/3