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Shannon v. Koehler - Northern District of Iowa

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to predicate facts.” Peterson v. City <strong>of</strong> Plymouth, 60 F.3d 469, 475 (8th Cir.1995) (citing<br />

Arnott v. Mataya, 995 F.2d 121, 123-24 (8th Cir. 1993)). Therefore, an expert’s opinion<br />

“concerning the reasonableness <strong>of</strong> the <strong>of</strong>ficers’ conduct in light <strong>of</strong> ‘Fourth Amendment<br />

standards’” is a “legal conclusion”on the ultimate issue <strong>of</strong> law, not a “fact-based opinion”<br />

that will assist the jury. See id.; accord Estes v. Moore, 993 F.2d 161, 163 (8th Cir.<br />

1993) (finding that because the ultimate conclusion on probable cause is a question <strong>of</strong> law,<br />

expert’s opinion on whether probable cause existed was an inadmissible “legal<br />

conclusion”); see also Schmidt v. City <strong>of</strong> Bella Villa, 557 F.3d 564, 570 (8th Cir. 2009)<br />

(finding “opinions regarding the overall reasonableness” <strong>of</strong> evidence collection and strip<br />

search procedures to be “impermissible legal conclusions,” not “fact-based opinions”).<br />

The Eighth Circuit Court <strong>of</strong> Appeals has likewise concluded that the ultimate<br />

question in excessive force cases is one <strong>of</strong> law: “‘Once the predicate facts are established,<br />

the reasonableness <strong>of</strong> the <strong>of</strong>ficial’s conduct under the circumstances is a question <strong>of</strong> law.’”<br />

McKenney, 635 F.3d at 359 (quoting Mann v. Yarnell, 497 F.3d 822, 825 (8th Cir. 2007)).<br />

Therefore, an expert’s opinion in an excessive force case concerning the “reasonableness”<br />

or “excessiveness” <strong>of</strong> an <strong>of</strong>ficer’s conduct under the Fourth Amendment would be an<br />

impermissible legal conclusion, not a fact-based opinion.<br />

Nevertheless, courts have found that a police procedure expert’s testimony may be<br />

proper on issues other than the “reasonableness” <strong>of</strong> an <strong>of</strong>ficer’s conduct under Fourth<br />

Amendment standards. See, e.g., Coleman v. Rieck, 154 F. App’x 546, 549 (8th Cir.<br />

2005) (affirming district court’s denial <strong>of</strong> judgment as a matter <strong>of</strong> law for the plaintiff<br />

where defendant <strong>of</strong>ficers’ testimony, as well as “testimony from their expert that the force<br />

did not exceed national standards, supported the verdict that the force used was not<br />

excessive”) (citation omitted)); Wilson v. City <strong>of</strong> Des Moines, 293 F.3d 447, 453-54 (8th<br />

Cir. 2002) (finding question <strong>of</strong> fact existed, based on police-procedure expert’s testimony<br />

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