The following excerpt is from U.S. v. Armstrong, 48 F.3d 1508 (9th Cir. 1994):
We note, however, that we review certain types of rulings under an abuse of discretion or clearly erroneous standard rather than de novo because of the trial court's " 'experience with the mainsprings of human conduct.' " United States v. McConney, 728 F.2d 1195, 1202 (9th Cir.1984) (en banc) (quoting Commissioner v. Duberstein, 363 U.S. 278, 289, 80 S.Ct. 1190, 1198-99, 4 L.Ed.2d 1218 (1960)).
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