Ohio Rev. Code § 5525.06: Subcontractor must be properly qualified.

No successful bidder shall enter into a subcontract with any other person, involving the performance of any part of any work upon which the bidder may be engaged for the department of transportation, unless the subcontractor has been properly qualified for the work sublet to the subcontractor or the subcontractor is eligible for participation without previous qualification under rules adopted by the director of transportation under section 5525.05 of the Revised Code.