Ohio Revised Code Title XLV. Motor Vehicles Aeronautics Watercraft § 4585.08

If an action is commenced under sections 4585.01 to 4585.14, inclusive, of the Revised Code, without reasonable or probable cause, the person commencing it shall be liable to make compensation to the defendant for all damage sustained by him by reason thereof. If the defendant appears, defends, and is damaged, he shall set forth in his answer, or in a written statement if the cause is before a judge of a county court, that such an action was commenced without reasonable or probable cause to his damage. If on the trial it is found that such action was begun without reasonable or probable cause, the damage sustained by the defendant shall be assessed, judgment rendered therefor, and execution issued as in other cases.