During the long reign of Azzarello v. Black Brothers, 391 A.2d 1020 (Pa. 1978), as the foundation of strict products liability in Pennsylvania, the strict separation of “negligence” and “strict liability” imposed by that decision led to a number of secondary exclusions of evidence and theories. The first of these involved so-called “state of the art” evidence, of which there are several subsets: (1) scientific unknowability; (2) governmental standards; and (3) industry standards.

In Lewis v. Coffing Hoist Division, 528 A.2d 590 (Pa. 1987), the court, citing to Azzarello’s negligence/strict liability dichotomy, held that evidence of industry customs and standards should be inadmissible in strict liability actions. Discussing Azzarello, the court said, “We also concluded, if not expressly, then certainly by clear implication, that negligence concepts have no place in a case based on strict liability.” Therefore, the court decided, “evidence of industry standards … go to the reasonableness of the [defendant's] conduct in making its design choice,” and “conclude[d] that such evidence would have improperly brought into the case concepts of negligence law.”

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