5 ILCS 220/3
Any power or powers, privileges, functions, or authority exercised or which may be exercised by a public agency of this State may be exercised, combined, transferred, and enjoyed jointly with any other public agency of this State and jointly with any public agency of any other state or of the United States to the extent that laws of such other state or of the United States do not prohibit joint exercise or enjoyment and except where specifically and expressly prohibited by law. This includes, but is not limited to, (i) arrangements between the Illinois Student Assistance Commission and agencies in other states which issue professional licenses and (ii) agreements between the Department of Healthcare and Family Services (formerly Illinois Department of Public Aid) and public agencies for the establishment and enforcement of child support orders and for the exchange of information that may be necessary for the enforcement of those child support orders.
5 ILCS 220/3