Ohio Rev. Code Ann. § 2307.96 – Asbestos claim - multiple defendants - substantial factor test

(A) If a plaintiff in a tort action alleges any injury or loss to person resulting from exposure to asbestos as a result of the tortious act of one or more defendants, in order to maintain a cause of action against any of those defendants based on that injury or loss, the plaintiff must prove that the conduct of that particular defendant was a substantial factor in causing the injury or loss on which the cause of action is based.
(B) A plaintiff in a tort action who alleges any injury or loss to person resulting from exposure to asbestos has the burden of proving that the plaintiff was exposed to asbestos that was manufactured, supplied, installed, or used by the defendant in the action and that the plaintiff's exposure to the defendant's asbestos was a substantial factor in causing the plaintiff's injury or loss. In determining whether exposure to a particular defendant's asbestos was a substantial factor in causing the plaintiff's injury or loss, the trier of fact in the action shall consider, without limitation, all of the following:
1. (1) The manner in which the plaintiff was exposed to the defendant's asbestos;
2. (2) The proximity of the defendant's asbestos to the plaintiff when the exposure to the defendant's asbestos occurred;
3. (3) The frequency and length of the plaintiff's exposure to the defendant's asbestos;
4. (4) Any factors that mitigated or enhanced the plaintiff's exposure to asbestos.
(C) This section applies only to tort actions that allege any injury or loss to person resulting from exposure to asbestos and that are brought on or after the effective date of this section.