510 ILCS 35/12.6
When, for the protection of the livestock herds of Illinois, and in the interest of the general public, in the opinion of the Department of Agriculture it is deemed advisable, said Department shall have the authority to require negative tuberculin testing prior to entry into Illinois and or prior to exhibition in Illinois, and to quarantine for tuberculosis all cattle, sheep, goats, antelope, cervids, or bison shipped into Illinois or from a public stock yard through regulations promulgated by the Department and approved by the Advisory Board of Livestock Commissioners. However, no tuberculin test shall be required for any cattle exhibiting in the State of Illinois that originate from a Tuberculosis Accredited Free State as defined under the Bovine Tuberculosis Eradication Uniform Methods and Rules approved by the U. S. Department of Agriculture.
510 ILCS 35/12.6