Ohio Rev. Code Ann. § 2503.39

Oral arguments must be heard in a cause in the supreme court if either party so requests, but the written arguments of counsel may be transmitted to the court, placed on file with the papers, and read by the court in the investigation of the cause. In cases involving the constitutionality of a law of the state, the court, upon request, shall permit not more than two attorneys at law on each side, in addition to the attorneys engaged by the parties, to be heard orally, or in writing, as such attorneys prefer.