1. Whether an instructional error is "plain" for purposes of Fed. R. Crim. P. 52(b) when the charge to the jury is erroneous under an opinion of this Court interpreting an identical term in a related statute.

2. Whether the knowingly mens rea in 21 U.S.C. § 960 applies to the type and quantity of controlled substance involved in the offense when those elements are used to establish mandatory minimum and enhanced maximum sentences.

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