Drug Test- Postive or Negative For PGA Tour?

So now with actual drug testing on the PGA Tour and European Tour how long will it be before someone tests positive for a banned substance. Many out there seem to think it will never happen that players are too cautious and know what is ok and what isn't and that alot of the substances on the "list" in fact wouldn't even help a professional golfer. Others think individuals will be caught it's just a matter a time someone will slip up and their blood pressure pills or diet pills or some kind of new supplement will test positive. It will definitely make for more buzz is a positive test ever does come out.