Local laws may allow the legal sale of marijuana in many states, but federal laws still class it as a drug like heroin. And that means no banks. Weed-selling, even legal weed-selling, is a cash-only business, and that includes paying taxes.
Dealing in all cash is a minor headache at the dispensary level, with the usual concerns of making change, combined with the unusual requirement to store all that money safely. But what about paying growers, or distributors? Or paying your sales tax? Then things quickly get out of hand.
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