Does expert testimony that usurps the role of the jury in making a decision?

^2. See, e.g.., Nimely v. City of New York, 414 F.3d 381, 397 (2d Cir. 2005) ("We have consistently held . . . that expert testimony that usurps . . . the role of the jury in applying [the] law to the facts before it by definition does not aid the jury in making a decision; rather, it undertakes to tell the jury what result to reach, and thus attempts to substitute the expert's judgment for the jury's." (internal quotation marks, brackets, and citations omitted)); United States v. Boissoneault, 926 F.2d 230, 233 (2d Cir. 1991).