The following excerpt is from United States v. Pinzon-Gallardo, 13-4615-cr (2nd Cir. 2014):
must be cautious of officers straying from their expert functions and the "impermissible substitution of expert opinion for factual evidence" that may result. United States v. Mejia, 545 F.3d 179, 190 (2d Cir. 2008).
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