The following excerpt is from Hall v. U.S., 60 F.3d 833 (9th Cir. 1995):
A defendant relinquishes his challenge of an indictment if he forgoes the opportunity before entering his guilty plea. See United States v. Broce, 488 U.S. 563, 571 (1989); see also United States v. Kahlon, 38 F.3d 467, 469 (9th Cir.1994) (defendant waives his objections to procedural defects in the entry of the indictment if they are not raised before trial).
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