Ohio Rev. Code Ann. § 109.121

Prior to the acquisition by the state of any right, title, or interest in real property, except highway rights-of-way, evidence of such right, title, or interest shall be submitted to the attorney general for his review and opinion. Such evidence shall be that customarily and generally used in the community in which the real property is situated and may consist of, but not be limited to, attorneys' opinions of title, abstracts of title, title guarantees, or title insurance.