One major effect of this is that weed stores will be able to use banks and payment processors legally once the regulators catch up.
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(Call me crazy and old-fashioned, but I don't think I'd want 50+ illegally-correlated transactions on my financial record that the government could lump into other charges...)
it's just a function of time and process, and while you can dispose of plants and bury money in your back yard, you can't undo old bank transactions. 20 years later those records may not be a thing, but last year sure will be...