This really is no different than dealing in cash presently. Employees still need to report their income, even when paid in cash, so even in that event they'd still be subject to any laundering concerns of the federal government given the paper trail follows back to the dispensary entity. Same with any other entities they're paying in cash (unless they are dodging reporting requirements).
Crypto solves the problem (partially) of where to store your revenue instead of a bank. Its just a better way than the alternative of paying security outfits to guard your heaps of cash— its judgment-resistant and reasonably easy to liquidate.
The biggest problem with that use case right now is obviously price fluctuations. Not sure anyone is comfortable using a volatile asset class for that at present.