The decision of the court of appeals was vacated .
The case was remanded back to the Fourth Circuit to consider the jury instructions as failing to convey the Analogue Act 's requirement of assessing the defendant 's knowledge of the substances as controlled .
The decision of the court of appeals was vacated and the case was remanded back to the Fourth Circuit to consider the jury instructions as failing to convey the Analogue Act 's requirement of assessing the defendant 's knowledge of the substances as controlled .