15 ILCS 405/6
The comptroller shall keep an official seal, which shall be used to authenticate all writings, papers, documents and accounts required by law to be certified from his office. Copies of all records, writings, papers and documents legally in his keeping, when certified by the comptroller and authenticated by his official seal, shall be received in evidence in the same manner and with like effect as the originals. All books of account with collectors and other officers and persons with whom the comptroller is under the duty to keep accounts, and certified copies thereof and statements therefrom, authenticated by the comptroller under his official seal, shall be prima facie evidence that these accounts and statements and the amounts thereon shown as due to the State are correct.
15 ILCS 405/6