Ohio Rev. Code § 2945.57
The number of witnesses who are expected to testify upon the subject of character or reputation, for whom subpoenas are issued, shall be designated upon the praecipe and, except in cases of murder in the first and second degree, manslaughter, rape, assault with intent to commit rape, or selling intoxicating liquor to a person in the habit of becoming intoxicated, shall not exceed ten upon each side, unless a deposit of at least one per diem and mileage fee for each of such additional witnesses is first made with the clerk of the court of common pleas. Not more than ten witnesses upon each side shall be permitted to testify upon the question of character or reputation in a criminal cause unless their full per diem and mileage fees have been deposited or paid by the party in whose behalf they are sworn, and the clerk shall not issue a certificate for compensation to be paid out of the county treasury to a witness who has testified upon the subject of character or reputation, except as provided in this section.
R.C. §2945.57