the sophisticated user defense, a supplier has no duty to warn the ultimate user if it has reason to believe that the user will realize its dangerous condition. Gray v. Badger Mining Corp., 676 N.W.2d 268, 276 (Minn.2004); see also Ritchie v. Glidden, 242 F.3d 713, 724 (7th Cir.2001) (stating, under Indiana law, that the sophisticated purchaser defense to a failure-to-warn claim brought under negligence or strict liability theories provides that product suppliers do not have a duty to warn employees or customers of knowledgeable industrial purchasers as to product-related hazards). In addition to limiting a supplier’s duty, the “sophisticated user” concept also affects the element of proximate cause. Crook v. Kaneb Pipe Line Operating P’ship, L.P., 231 F.3d 1098, 1102 (8th Cir.2000) (<HOLDING>); Strong, 667 F.2d at 688 (“Even if [the
holding that negligence must be the proximate cause of injury holding in a negligence action that the air traffic controllers failure to warn of an impending danger cannot be the proximate cause of an injury after the pilot himself discovered its presence appreciated the danger and decided to fly ahead into it holding that use of tangible property must be proximate cause of injury and that property does not cause injury if it does no more than furnish the condition that makes the injury possible holding that if a user actually knows of the danger a failure to warn cannot be a proximate cause of the injury holding that a physicians negligence need only be a proximate cause not the proximate cause of plaintiffs injury