Re: Elon & Drugs
They CAN prosecute in the "legal" states since it is still a federal crime, they just have chosen to ignore it. There was a lot of worry that it might be enforced under Trump, since republicans are more anti-drug than democrats, and Trump is known to be against drugs and alcohol since his older brother Fred was a chronic alcoholic who died in his early 40s.
Republicans only believe in states rights when it is republican states making laws different than the federal government (like abortion) but not when it is democrat states making laws different than the federal government. However, the DOJ seems far more concerned with going after immigrants right now than pot smokers in California, but if Pence becomes president look out - he's always been very anti-drug and doesn't care nearly as much about immigration as Trump so he would probably change the DOJ's focus.
If a state decriminalizes other drugs then they'd probably enforce it regardless of who is in power and it would wind up in the Supreme Court.