Whether the definition of 'controlled substance offense' in the Federal Sentencing Guidelines §4B1.2(b) is limited to substances defined and regulated under the federal Controlled Substances Act

QUESTION PRESENTED Whether “controlled substance[s]” in the Federal Sentencing Guidelines §4B1.2(b) are limited to those substances defined and regulated under the federal Controlled Substances Act, 21 U.S.C. § 801 et seq. i