The following excerpt is from U.S. v. Barbosa, 927 F.2d 611 (9th Cir. 1991):
The scope of voir dire examination is "within the sound discretion of the trial judge, and will not be disturbed on appeal unless the procedures used or questions propounded are so unreasonable as to constitute an abuse of discretion." United States v. Baldwin, 607 F.2d 1295, 1297 (9th Cir.1979). It is wholly within the judge's discretion to reject supplemental questions proposed by counsel if the voir dire is otherwise reasonably sufficient to test the jury for bias or partiality. Id.
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