I was in a small argument recently with some pre-law student over marijuana laws in Colorado and California. We're both from Canada so I don't know US law that well, so I'm hoping you guys can help clear this up (maybe with some sources): - regarding the legalization of weed in Colorado, I was saying that it's good that the Federal government hasn't stepped in to block the legalization so that we can see the social and economic effects etc. The guy I was talking to said that Federal law couldn't override State law so it didn't matter if Obama wanted to block the legalization. I was under the impression that drugs are regulated by the federal government so it has final say? - the guy was saying weed in California is legal. As far as I know, it's allowed for medical reasons although it isn't difficult to get a card but it's not completely "legal" as in you can't grow your own and they've been shutting down weed stores. I've done a bit of Googling and I think I'm right on both points. Can anyone confirm what is correct?