510 ILCS 40/15

Any authorized representative of the Department or any law enforcement officer may, for the purpose of enforcing this Act, enter during usual working hours any premise, building, or other place where livestock may be present; provided, sanitized footwear furnished by the responsible agency is used as well as any other reasonable disease prevention procedures or equipment as may be furnished by the owner or operator of the premise. These sanitation precautions apply only to an individual farm operation or management facility.