30 ILCS 517/15

(a) Each contract awarded by a purchasing agency on or after the effective date of this Act through the use of the preference required under Section 10 shall contain the contractor's certification that procured products provided pursuant to the contract or a subcontract shall be manufactured in the United States. (b) Chief procurement officers, as provided in Section 20-45 of the Illinois Procurement Code, and the Capital Development Board, as provided in Section 30-20 of the Illinois Procurement Code, must promulgate rules for prequalification of suppliers and contractors under this Section.