215 ILCS 5/2.1
It is declared to be the public policy of this State, pursuant to paragraphs (h) and (i) of Section 6 of Article VII of the Illinois Constitution of 1970, that any power or function set forth in this Act to be exercised by the State is an exclusive State power or function. Such power or function shall not be exercised concurrently, either directly or indirectly, by any unit of local government, including home rule units, except as otherwise provided in this Act. Provided further that the fees, charges and taxes provided for by this Act shall, as provided for in Section 415 of this Act, be in lieu of all license fees or privilege or occupation taxes or other fees levied or assessed by any home rule unit and said Section 415 of this Act is declared to be a denial and limitation of the powers of home rule units pursuant to paragraph (g) of Section 6 of Article VII of the Illinois Constitution of 1970.
215 ILCS 5/2.1