Ohio Revised Code Title XXXVII. Health Safety Morals § 3723.17

(A) If radon testing or mitigation is performed or any related advice is provided in accordance with any procedures established under federal law or the Revised Code, the liability of a licensed radon tester, mitigation specialist, or mitigation contractor for injury, death, or loss to person or property allegedly caused by or otherwise related to radon testing or mitigation or related advice is limited to liability for actions or omissions that are established, by a preponderance of the evidence, to have been negligent. Establishment by a preponderance of the evidence that actions or omissions relating to radon testing or mitigation or related advice were at the time of occurrence in accordance both with generally accepted practice and with any procedures established under federal law or the Revised Code creates a rebuttable presumption that the actions or omissions were not negligent.

(B) The liability of an individual or business entity, other than the owner or occupant of the affected building or real property, contracting with a licensed radon tester, mitigation specialist, or mitigation contractor for injury, death, or loss to person or property allegedly caused by the radon tester, mitigation specialist, or mitigation contractor is limited to actions or omissions that the individual or business entity knew, or reasonably should have known, were not, at the time of occurrence, in accordance with generally accepted practice or with any procedures established under federal law or the Revised Code.

(C) This section governs all claims for injury, death, or loss to person or property arising from radon testing or mitigation or the provision of any related advice.