225 ILCS 610/2
Except as otherwise provided in this Section, no person shall engage in the business of disposing of the bodies or parts of bodies of dead animals, poultry or fish, or used cooking grease and oils, in the State without first obtaining a license or licenses for that purpose from the Department. An owner, operator, or animal collection service may convey dead animals to a licensed landfill facility when no rendering service is available. Such transport shall be direct and not in conjunction with other collection activities, except for waste haulers collecting waste in which a dead animal is included incidental to the collection of such waste. No license or permit is required for any owner, operator or caretaker to convey dead animals to a landfill facility licensed under the Environmental Protection Act.
225 ILCS 610/2