Whether the categorical approach is required to determine if a State conviction qualifies as a 'felony drug offense' under the Controlled Substances Act?

QUESTIONS PRESENTED (1) Whether the categorical approach is required to determine if a State conviction qualifies as a “felony drug offense” under the Controlled Substances Act? (2) Whether the Eighth Circuit properly considered the “lowest level of conduct” as required under this Court’s precedent, and whether any uncertainty in state law should benefit the defendant, as the Fifth Circuit has held?