Ohio Rev. Code § 5703.23: Attorney general or prosecuting attorney shall aid in investigations or hearings.

Upon the request of the department of taxation, the attorney general shall aid in any investigation, hearing, or trial had under the laws which the department is required to administer, shall institute and prosecute all necessary actions for the enforcement of such laws, and for the punishment of all violations thereof. The prosecuting attorney of any county shall, upon the request of the department and under the direction of the attorney general, perform similar duties as to any offense arising within the county in which he was elected.