U.S. Attorney General Eric Holder has repeatedly expressed concern about that situation, which also affects state-licensed pot stores in Colorado. "You don't want just huge amounts of cash in these places," Holder said during an appearance at the University of Virginia in January. "They want to be able to use the banking system. There's a public safety component to this. Substantial amounts of cash, just kind of lying around with no place for it to be appropriately deposited, is something that would worry me, just from a law enforcement perspective." But the solutio...