A little clarification please

I was talking to someone the other day who was considering a driving career. He tells me that he uses medical marijuana (we are in California where it is legal for medical use). I told him that, although the administration and legislation over the regulations over commercial drivers is delegated to the state level, the feds control the DOT and the actual content of those regulations. Since the federal government does not recognize the validity of the medical uses for marijuana, it is not allowed. This even forgets about the fact that there is not a consensus among the individual states, some allow it, while others don't.

Even if the feds do ever recognize the medical uses, it is not likely that will change for drivers in the interest of safety behind the wheel on the road.

Am I correct in this assessment?

 

His biggest issue was marijuana. He didn't tell me what he needed it for, but did show me his med card.

I know that Washington and Colorado also have legalized marijuana for recreational use, but there have been cases of people getting med cards that are fraudulent (meaning a doctor traded money for his signature regardless of the validity of the claim).