Ohio Rev. Code Ann. § 2307.92
(B) No person shall bring or maintain a tort action alleging an asbestos claim based on a nonmalignant condition in the absence of a prima-facie showing, in the manner described in division (A) of section 2307.93 of the Revised Code, that the exposed person has a physical impairment, that the physical impairment is a result of a medical condition, and that the person's exposure to asbestos is a substantial contributing factor to the medical condition. That prima-facie showing shall include all of the following minimum requirements:
(1) Evidence verifying that a competent medical authority has taken a detailed occupational and exposure history of the exposed person from the exposed person or, if that person is deceased, from the person who is most knowledgeable about the exposures that form the basis of the asbestos claim for a nonmalignant condition, including all of the following:
(3) A diagnosis by a competent medical authority, based on a medical examination and pulmonary function testing of the exposed person, that all of the following apply to the exposed person:
(b) Either of the following:
(i) The exposed person has asbestosis or diffuse pleural thickening, based at a minimum on radiological or pathological evidence of asbestosis or radiological evidence of diffuse pleural thickening. The asbestosis or diffuse pleural thickening described in this division, rather than solely chronic obstructive pulmonary disease, is a substantial contributing factor to the exposed person's physical impairment, based at a minimum on a determination that the exposed person has any of the following:
(ii) If the exposed person has a chest x-ray showing small, irregular opacities (s, t) graded by a certified B-reader as only a 1/0 on the ILO scale, then in order to establish that the exposed person has asbestosis, rather than solely chronic obstructive pulmonary disease, that is a substantial contributing factor to the exposed person's physical impairment the plaintiff must establish that the exposed person has both of the following:
(C)
(1) No person shall bring or maintain a tort action alleging an asbestos claim based upon lung cancer of an exposed person who is a smoker, in the absence of a prima-facie showing, in the manner described in division (A) of section 2307.93 of the Revised Code, that the exposed person has a physical impairment, that the physical impairment is a result of a medical condition, and that the person's exposure to asbestos is a substantial contributing factor to the medical condition. That prima-facie showing shall include all of the following minimum requirements:
(c) Either of the following:
(D)
(1) No person shall bring or maintain a tort action alleging an asbestos claim that is based upon a wrongful death, as described in section 2125.01 of the Revised Code of an exposed person in the absence of a prima-facie showing, in the manner described in division (A) of section 2307.93 of the Revised Code, that the death of the exposed person was the result of a physical impairment, that the death and physical impairment were a result of a medical condition, and that the deceased person's exposure to asbestos was a substantial contributing factor to the medical condition. That prima-facie showing shall include all of the following minimum requirements:
(c) Either of the following:
(G) All of the following apply to the court's decision on the prima-facie showing that meets the requirements of division (B), (C), or (D) of this section: