Whether the Sentencing Commission may add a crime to the Sentencing Guideline definition of a 'controlled substance offense' without Congressional approval or a notice-and-comment period

QUESTION PRESENTED Whether the Sentencing Commission, without Congressional approval or a notice-and-comment period, may add a crime to the Sentencing Guideline definition of a “controlled substance offense” when doing so yields a result inconsistent with the categorical approach to 21 U.S.C. § 843(b).