Yeah, still in very early stages, but an interesting topic to research nonetheless. It's super tough to regulate as a country, especially with the impending purchasing limits over a certain period of time. At a provincial level, someone might be able to purchase an amount of marijuana in one province and go and make the same purchase in a different province before the systems updated to reflect the intial purchase.

Blockchain provides an interesting solution to this specific problem in the speed and unified nature the digital ledger would entail..

You should also check out VEChain over in China if you want more Crypto-Govt Interaction, very interesting stuff :)