Ohio Revised Code Title XXIII. Courts Common Pleas § 2317.52

When the action or proceeding relates to a transaction or occurrence in which it has been shown or it is admitted that the adverse party acted either in whole or in part through an agent or employee, such agent or employee of the adverse party may be called as a witness and examined as if under cross-examination upon any matters at issue between the parties which are shown or admitted to have been within the scope of such agent's or employee's authority or employment.

The party calling for such examination shall not thereby be concluded but may rebut such agent's or employee's testimony by counter testimony.

The party whose agent or employee is called as a witness by the adverse party and whose agent or employee is examined as if under cross-examination shall not thereby be concluded but may rebut such agent's or employee's testimony by counter testimony.