Ohio Rev. Code § 2151.15
When a county department of probation has been established in the county and the juvenile judge does not establish a probation department within the juvenile court as provided in section 2151.14 of the Revised Code, all powers and duties of the probation department provided for in sections 2151.01 to 2151.54, inclusive, of the Revised Code, shall vest in and be imposed upon such county department of probation.
In counties in which a county department of probation has been or is hereafter established the judge may transfer to such department all or any part of the powers and duties of his own probation department; provided that all juvenile cases shall be handled within a county department of probation exclusively by an officer or division separate and distinct from the officers or division handling adult cases.
R.C. §2151.15