Ohio Rev. Code Ann. § 2335.05

In all cases or proceedings not specified in sections 2335.06 and 2335.08 of the Revised Code, except as otherwise provided in section 2335.061 of the Revised Code, each person subpoenaed as a witness shall be allowed one dollar for each day's attendance and the mileage allowed in courts of record. If not subpoenaed each person called upon to testify in a case or proceeding shall receive twenty-five cents. Such fee shall be taxed in the bill of costs, and if incurred in a state or ordinance case, or in a proceeding before a public officer, board, or commission, the fee shall be paid out of the proper public treasury, upon the certificate of the court, officer, board, or commission conducting the proceeding.