820 ILCS 405/2306
A copy of any finding or decision of a claims adjudicator, Referee or the Board of Review and of any decision, order, ruling, determination and assessment, statement of benefit wages, statement of benefit charges, or rate determination made by the Director, and of any notice served by the Director, upon certification by the Commissioner of Unemployment Compensation or the Director to be a true and correct copy, and further certification that the records of the Director disclose that it was duly served upon the employing unit therein named, shall be admissible into evidence in all hearings and judicial proceedings as prima facie proof that it was made, rendered, or issued and that it was duly served upon such employing unit at the time and in the manner stated in such certification.
820 ILCS 405/2306