In San Francisco, it's legal to possess, but illegal to purchase.
Email me and I would be happy to elaborate.
Even if it was true that it is outright legal in SF (which it's not) you're ignoring the fact that the feds can bust someone without regard to local laws. This is off topic, but if someone moving to SF took your words at face value they could get into trouble.
>if someone moving to SF took your words at face value
I give the users of this site a lot more credit than that.
What makes you think so?