all exposures contribute

On January 31, 2017, President Trump nominated Judge Neil Gorsuch to the U.S. Supreme Court. Although time will tell, this post assumes he will make it through the Senate confirmation process, and take his place at 1 First Street, Northeast. Currently, Judge Gorsuch sits on the United States Court of Appeals for the Tenth Circuit, having been appointed to same by President George W. Bush on July 20, 2006.  While at the Tenth, Judge Gorsuch issued two interesting decisions which may prove instructive as to how he views the Court’s role as the evidentiary gatekeeper[1] of expert testimony. A discussion of those two cases, and what they foretell with regard to “all exposures contribute” testimony follows.

Graves v. Mazda Motor Corp., 2010 WL 5094286.

This case arises out of Mrs. Graves’ trip to Hattiesburg, Mississippi. Upon arriving at the Hattiesburg airport, she picked up her rental car—a Mazda 6 with an automatic transmission. At the end of her stay and while en route to the airport to depart for home, Mrs. Graves got lost and pulled over to ask for directions. When exiting the car, Mrs. Graves left the engine running but thought she had placed the car’s shifter in “park.” As it turns out, the gear shifter was in “reverse” and, when she stepped out, the car rolled backwards, knocked her to the ground, and ran her over. Mrs. Graves sought damages from Mazda for the injuries she suffered, alleging that the company’s gear shifter was defectively designed. In support of her claim, she offered expert testimony from an expert human factors engineer. The district court, however, excluded the expert’s testimony as unreliable and then, given the absence of any other probative evidence of liability, granted Mazda’s summary judgment motion. On appeal, the plaintiff sought to undo the district court’s decision.

The district court noted that the expert failed to provide any data or industry standard, or to conduct any testing to confirm his view that Mazda’s gear shift design was defective. Instead, the expert’s proffered testimony that merely described how the Mazda shifter works, and from this, his leap to the conclusion that Mazda’s design fails to allow for “smooth” shifting and so is defective and unreasonably dangerous.

Judge Gorsuch, writing for the three judge panel (Kelly, J., Ebel, J.) noted that without any reference to data suggesting how “smoothly” an ordinary consumer would expect a gear shift to move, without any confirming evidence indicating how Mazda’s design might cause shifting troubles for ordinary drivers, without any reference to how engineering standards might have counseled against Mazda’s gear shift design, and without any other evidence suggesting its reliability, the district court was right to exclude the expert’s testimony. Judge Gorsuch noted that the expert did provide a list of “safety systems analysis” techniques that, he contended, Mazda should have used in assessing its design, but even here, the expert failed to offer any evidence suggesting that Mazda actually failed to use these techniques, or if it
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