515 ILCS 5/20-60
The Department of Natural Resources may in its discretion enter into reciprocal fishing agreements with the States of Missouri, Iowa, Wisconsin, Kentucky, and Indiana to permit persons licensed or legally exempt from licenses by those states to fish in any of the waters forming a boundary between those states and the State of Illinois and lying within the territorial jurisdiction of this State in the same manner and to the same extent that persons holding or legally exempt from Illinois licenses may do if the laws of Missouri, Iowa, Wisconsin, Kentucky, and Indiana, respectively, extend a similar privilege to persons licensed or legally exempt under the laws of this State. Such an agreement shall be made subject, however, to the duties, responsibilities, and liabilities imposed on its own licensees by the terms of this Code and the laws of this State and shall be further subject to revocation at any time whenever revocation shall be deemed necessary in the discretion of the Department of Natural Resources of this State.
515 ILCS 5/20-60