225 ILCS 60/3

No person shall practice medicine, or any of its branches, or treat human ailments without the use of drugs and without operative surgery, without a valid, active license to do so, except that a physician who holds an active license in another state or a second year resident enrolled in a residency program accredited by the Liaison Committee on Graduate Medical Education or the Bureau of Professional Education of the American Osteopathic Association may provide medical services to patients in Illinois during a bonafide emergency in immediate preparation for or during interstate transit.