Indiana Code Title 34. Civil Law and Procedure § 34-20-6-5

Sec. 5. It is a defense to an action under this article (or IC 33-1-1.5 before its repeal) that a cause of the physical harm is a modification or alteration of the product made by any person after the product's delivery to the initial user or consumer if the modification or alteration is the proximate cause of physical harm where the modification or alteration is not reasonably expectable to the seller.