Actually the US Attorney General, Eric Holder, just came out in a that it's not a crime for banks to take money from legal pot dispenseries.
http://swampland.time.com/2014/01/24/signs-of-a-big-shift-on-u-s-marijuana-regulation/
So now the only thing stopping the pot dispenseries, is simply the banks themselves not wanting to deal with "drug money"....hypocracy for sure since HSBC and others often launder money for drug cartels and gun runners.
The truth in bold