Yes but see the thing is, banks need their facade to be backed up by stout integrity. Have you seen CA's budget crisis lately?
Yeah, "The Bank of California". Go ahead, stick your wad in that one and see what happens. They are so stupid in Sacramento that they still can't figure out that selling pot across their borders to states where it's illegal still (that's their plan, believe it or not) is going to bring that whole thing crashing down on their backs. Good luck with that "bank"...
If Mexico can't sell pot to New York, California cannot either.