Ohio Rev. Code § 4509.21
A person is relieved from the requirement for deposit of security if he is fully released from liability for any property damage and personal injury by all person injured or damaged in the accident. When an injury or damage claim has been subrogated to an insurance company and a copy of such subrogated claim has been filed with the bureau of motor vehicles, a release shall be required from that insurance company. For this purpose a covenant not to sue has the same effect as a release.
If the registrar of motor vehicles has evaluated the injuries or damages to a minor in an amount not more than two hundred dollars the registrar may accept, for the purpose of this section only, evidence of a full release from all liability for personal injury and property damage executed by a natural guardian or a legal guardian on behalf of such minor without the approval of any court.
R.C. §4509.21