The following excerpt is from U.S. v. Nelson, 918 F.2d 181 (9th Cir. 1990):
A trial court possesses broad authority to admit or exclude expert testimony, and its ruling will be upheld unless manifestly erroneous. United States v. Kinsey, 843 F.2d 383, 388 (9th Cir.), cert. denied, 487 U.S. 1223 (1988).
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