505 ILCS 110/7.1

No person shall be subject to the penalties of this Act for having sold or exposed for sale agricultural, vegetable or other seeds designated by the Department of Agriculture which were incorrectly labeled or represented as to kind, variety, type or origin (if required) which seeds cannot be identified by examination thereof, unless he has failed to obtain an invoice, records or other labeling information and to take such other precautions as may be reasonable to insure the identity to be that stated.