Why? As long as you don't agree to some of what some require (You believe in a church of whatever, you join them in their endeavor, etc.), I don't see how buying from a taxed/licensed source is a different legal position than buying from your neighbor. The seller's criminal law position changes; but, the buyer's? I'll have to look at the use tax laws to see if they have addressed the changes with regulated/legal yet so I suppose you might need to pay a use tax on your annual tax return. Just like you do when you buy something over the internet who didn't collect the sales tax for your state in the transaction.