Let's Say the "Big Rig" Is in a State Where

Let's say the "big rig" is in a state where use of marijuana for medical purposes is permitted, and some of Vito's patrons have state-issued medical marijuana cards.According to a 2005 Supreme Court decision:

A) Federal authorities will be completely prohibited from charging Vito with a drug crime because local law permits the consumption of marijuana for medical purposes.
B) Federal authorities can still enforce the Controlled Substances Act in spite of local law permitting use of marijuana for medical purposes.
C) Federal authorities will need to invoke the Mann Act in order to engender a successful prosecution for the marijuna possession.
D) State authorities must provide consent in order for federal authorities to place Vito under arrest for possession of marijuana.