410 ILCS 635/11
When the enforcing agent has reasonable cause to suspect that a disease has been transmitted from any dairy farm, milk plant, cleaning and sanitizing facility, receiving station or transfer station, owner, operator, employee or milk hauler-sampler, the enforcing agency shall secure a morbidity history of the suspected individual, or make such other investigations as may be indicated and take appropriate action. The enforcing agency may require any or all of the following measures: (a) the immediate exclusion of the individual from the plant, station, cleaning and sanitizing facility, or milk tank truck; (b) the immediate closure of the plant, station, cleaning and sanitizing facility, or milk tank truck under the emergency provision as provided in this Act; (c) the restriction of the individual's services to some production or processing area where there would be no danger of transmitting disease; and (d) the adequate medical and laboratory examinations of the individual, and of his body discharges.
410 ILCS 635/11