Ohio Rev. Code Ann. § 2135.10

A mental health treatment provider of a declarant, a health care facility providing services to a declarant, or other authorized persons acting under the direction of either a mental health treatment provider of a declarant or a health care facility providing services to a declarant who administer or do not administer mental health treatment according to and in good faith reliance upon the validity of the declarant's declaration are not subject to criminal prosecution, are not liable in tort or other civil damages for injury, death, or loss to person or property, and are not subject to professional disciplinary action resulting from a subsequent finding of a declaration's invalidity.