What is the test for admitting or excluding expert testimony?
The following excerpt is from United States v. Arslanouk, No. 18-1390 (L), No. 18-2522, No. 18-2783, No. 18-3852 (2nd Cir. 2021):
Federal Rule of Evidence 702(a) permits a district court to admit the expert testimony of a witness "who is qualified as an expert by knowledge, skill, experience, training, or education." We review a district court's decision to admit or exclude expert testimony for abuse of discretion. See United States v. Cruz, 363 F.3d 187, 192 (2d Cir. 2004).1 A district court abuses its discretion in evidentiary rulings only when it acts "arbitrarily or irrationally." United States v. Nektalov, 461 F.3d 309, 318 (2d Cir. 2006).
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