Besides the fact that Cali has lots and lots of growers, there is no such thing as legally selling weed under prop 215. Even to dispensaries masquerading as 'collectives'. Period. If you choose to, you are definitely taking a risk. Anyone that says otherwise doesn't get it. Those are state and local risks. Federally, you are in the pickle of either declaring it and paying taxes, or having an undeclared income. Either of those choices carries some risk too. You'd be better off owning a dispensary and taking a salary, which is not technically a profit, but then again, any dispensary owner or past owner can tell you it's not easy, full of risks, especially federal, and operational/legal costs. This is the wild west, don't fool yourself into thinking profiteering off meds can be 100% legal or 100% safe at this point.