What is the test for admitting expert testimony at trial?
MultiRegion, United States of America
The following excerpt is from United States v. Leonard, 16-3379 (2nd Cir. 2018):
"[T]he decision of whether to admit expert testimony is left to the discretion of the trial judge and should not be set aside unless manifestly erroneous." United States v. Duncan, 42 F.3d 97, 101 (2d Cir. 1994) (internal quotation marks omitted). An expert may not "usurp either the role of the trial judge in instructing the jury as to the applicable law or the role of the jury in
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