30 ILCS 105/9.04
The certification on behalf of the State agency on every State voucher for goods and services other than a payroll or travel voucher shall be as follows:
"I certify that the goods or services specified on this voucher were for the use of this agency and that the expenditure for such goods or services was authorized and lawfully incurred; that such goods or services meet all the required standards set forth in the purchase agreement or contract to which this voucher relates; and that the amount shown on this voucher is correct and is approved for payment. If applicable, the reporting requirements of Section 5.1 of the Governor's Office of Management and Budget Act have been met.
....................................................
(Date) (Signature)"
For departments under the Civil Administrative Code of Illinois, the foregoing certification shall be executed by the Chief Executive Officer of the department from whose appropriation the payment will be made or his designee, in addition to any other certifications or approvals which may be required by law.
30 ILCS 105/9.04