The following excerpt is from U.S. v. Williams, 114 F.3d 1196 (9th Cir. 1997):
In the alternative, appellant contends that she was entitled to an evidentiary hearing on whether she in fact provided substantial assistance or on what her interpretation of substantial assistance might have been. She did not request any such hearing before the district court. Therefore, the issue is not properly before this court. See United States v. Flores-Payon, 942 F.2d 556, 558 (9th Cir.1991).
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