The following excerpt is from U.S. v. Weaver, 104 F.3d 351 (2nd Cir. 1996):
Weaver also attempts to assert a pro se argument that the substance seized from him was not crack. This contention, which was not a ground upon which his plea of guilty was made conditional, was waived by the plea, and we have no jurisdiction to consider it. See, e.g., United States v. Mann, 451 F.2d 346, 347 (2d Cir.1971) (per curiam).
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