510 ILCS 100/4

The Department shall investigate all cases or suspected cases of any contagious and infectious disease among swine in the State which it considers necessary, and shall protect the health of swine in the State from such diseases. The Department may prevent the importation of swine into this State which it has reason to believe are infected with any contagious or infectious disease or which have been exposed thereto. For the purposes of this Act, the Department may establish, maintain and enforce such quarantine regulations as it considers necessary.