Probably the IRS since they are the agency designated to collect taxes. As for "medical marijuana" being a hoax and scam, that's just my own opinion.
I never said anything about who should be enforcing the law. Take that crap somewhere else. I know bull**** when I see it and the "medical marijuana" thing is bull****.
So do you think the Commerce Clause delagates authority to fedgov to set intrastate medical marijuana policy rather than the states under the Tenth Amendment?