Sljslj

So a friend and I had a debate earlier:
We were talking about marijuana legalization and she said if it's legal in California, the federal police can still arrest you for possession, although the state police can't. It doesn't make sense to legalize it in a state if you can still get busted by the government for it. It seems to me that she's wrong, but she usually knows alot about this stuff, so maybe I'm wrong.
What do you think?

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