Ohio Rev. Code § 3109.61: Immunity.

A person who, in good faith, relies on or takes action in reliance on a power of attorney created under section 3109.52 of the Revised Code is immune from any criminal or civil liability for injury, death, or loss to persons or property that might otherwise be incurred or imposed solely as a result of the person's reliance or action. The person is not subject to any disciplinary action from an entity that licenses or certifies the person.

Any medical, psychological, or dental treatment provided to a child in reliance on a power of attorney created under section 3109.52 of the Revised Code shall be considered to have been provided in good faith if the person providing the treatment had no actual knowledge of opposition by the parent, guardian, or custodian.

This section does not provide immunity from civil or criminal liability to any person for actions that are wanton, reckless, or inconsistent with the ordinary standard of care required to be exercised by anyone acting in the same capacity as the person.