Does a prior drug conviction under a statute that included now decontrolled substances qualify as a 'controlled substance offense' to enhance a defendant's Guideline range and sentence?

QUESTION PRESENTED The Federal Sentencing Guidelines provide for an enhanced advisory Guideline range for certain offenses if the defendant has a prior conviction for a “controlled substance offense,” as that phrase is defined in USSG § 4B1.2(). The question presented is: Does a prior drug conviction under a statute that included now decontrolled substances qualify as a “controlled substance offense” to enhance a defendant’s Guideline range and sentence? i