Shannon v. Koehler - Northern District of Iowa
Shannon v. Koehler - Northern District of Iowa
Shannon v. Koehler - Northern District of Iowa
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determine a fact in issue, a witness qualified as an expert by<br />
knowledge, skill, experience, training, or education, may<br />
testify thereto in the form <strong>of</strong> an opinion or otherwise, if (1) the<br />
testimony is based upon sufficient facts or data, (2) the<br />
testimony is the product <strong>of</strong> reliable principles and methods,<br />
and (3) the witness has applied the principles and methods<br />
reliably to the facts <strong>of</strong> the case.<br />
FED. R. EVID. 702. In Daubert v. Merrell Dow Pharamceuticals, Inc., 509 U.S. 579<br />
(1993), the Supreme Court explained that the trial judge’s role under Rule 702 is to act as<br />
“gatekeeper,” admitting expert testimony only if it is both relevant and reliable. Id. at<br />
589. The Court later added in Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999), that<br />
this gatekeeping function applies to all types <strong>of</strong> expert testimony, not just scientific<br />
testimony. Id. at 147; see also Kudabeck v. Kroger Co., 338 F.3d 856, 860 (8th Cir.<br />
2003). The trial court is granted broad discretion in its determination <strong>of</strong> reliability.<br />
Kumho, 526 U.S. at 142.<br />
The Eighth Circuit Court <strong>of</strong> Appeals has explained that “[t]he gatekeeper role<br />
should not . . . invade the province <strong>of</strong> the jury, whose job it is to decide issues <strong>of</strong><br />
credibility and to determine the weight that should be accorded evidence.” United States<br />
v. Vesey, 338 F.3d 913, 917 (8th Cir. 2003) (citing Arkwright Mut. Ins. Co. v. Gwinner<br />
Oil Co., 125 F.3d 1176, 1183 (8th Cir. 1997)). “As the Supreme Court emphasized in<br />
Daubert, 509 U.S. at 595-96, ‘Vigorous cross-examination, presentation <strong>of</strong> contrary<br />
evidence, and careful instruction on the burden <strong>of</strong> pro<strong>of</strong> are the traditional and appropriate<br />
means <strong>of</strong> attacking shaky but admissible evidence.’” Id.; see also Synergetics, Inc. v.<br />
Hurst, 477 F.3d 949, 956 (8th Cir. 2007) (“[M]ere disagreement with the assumptions and<br />
methodology used does not warrant exclusion <strong>of</strong> expert testimony.”) (citing Daubert, 509<br />
U.S. at 596)).<br />
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