While there is no doubt that unused meds should be disposed of properly, and flushing them will put them in the water supply. I do have a problem understanding how they could build up enough to be detectable in a lake the size of TR or a river with the flow of the James. The theory that they are being flushed seems far fetched, unless its coming from the DNR, then we know its a coverup. That's a lot of expensive drugs being thrown out, and most, unlike antibiotics, would be usable in the future. Even the thought that someone overbought Viagra in a weak moment probably wouldn't produce enough to share through the water system.