Ohio Revised Code Title XXI. Courts Probate Juvenile § 2107.17

When a witness to a will, or other witness competent to testify at a probate or declaratory judgment proceeding, resides out of its jurisdiction, or resides within it but is infirm and unable to attend court, the probate court may issue a commission with the will annexed directed to any suitable person. In lieu of the original will, the probate court, in its discretion, may annex to the commission a photocopy of the will or a copy of the will made by any similar process. The person to whom the commission is directed shall take the deposition or authorize the taking of the deposition of the witness as provided by the Rules of Civil Procedure. The testimony, certified and returned, shall be admissible and have the same effect in the proceedings as if taken in open court.