Ill. Admin. Code tit. 44, § 1500.7015
a) Inspection of Plant or Site
The OG may enter, or authorize CMS to enter, a vendor's or subcontractor's plant or place of business to:
b) Inspection and Testing of Supplies and Services
c) Conduct of Inspections
d) Inspection of Construction Projects
On-site inspection of construction shall be performed in accordance with the terms of the contract.