Ohio Rev. Code Ann. § 5147.19

Except for prisoners participating in a county jail industry program established under section 5147.30 of the Revised Code, prisoners sentenced to hard labor under section 5147.18 of the Revised Code shall be under the control of the board of county commissioners, which may enact rules for the successful working of those prisoners according to sections 5147.01 to 5147.20 of the Revised Code. Sections 5147.01 to 5147.20 of the Revised Code do not authorize taking a prisoner convicted in a city from the control of the proper officer of the city and transferring him into the control of the board.