Engineered yeast paves way for home-brew heroin : Nature News & Comment
There's considerably more detail here on the story about yeast being engineered for making opiates.
I see that they haven't actually done it yet, or made it efficient, and the researchers are calling for serious discussion on regulation to prevent any such future engineered yeast from getting into the hands of the public.
In short, finding it being used by your neighbourhood bikies is likely many years away yet.
Sorry, any "war on drugs is futile" meme layers out there, this doesn't support your case. It shows what sensible people should do - regulate to do their best to prevent foreseeable future problems.