Question not identified.

Whether the categorical approach to determining whether a prior conviction constitutes a predicate offense requires courts to compare the specific conduct elements of 'attempted transfer' under 21 U.S.C. § 802(8) with 'attempted distribution' under 21 U.S.C. § 846, or whether aiding and abetting liability under 18 U.S.C. § 2 for distribution offenses sweeps more broadly than the underlying distribution statute itself