1. Does the phrase "controlled substance" in U.S.S.G. § 4Bl.2(b) , including as it is incorporated into U.S.S.G. § 2K2.1, include substances that are excluded from the CSA?

2. When defining an operative, but undefined, term in the Federal Sentencing Guidelines, should courts use analogous federal statutory definitions, should they use State statutory definitions, or should they use a judge -made "natural meaning'' of that term?

Whether the phrase 'controlled substance' in U.S.S.G. § 4B1.2(b) includes substances excluded from the Controlled Substances Act