Please stop flushing!

I have always thought as I hear of someone "flushing their old prescriptions down the toilet" that something would come of it.  Not only that, but the thought of tiny amounts of antibiotics in our water supply really creeps me out as to what else is in there that is not removed through normal processes? And it's not only the flushing of meds... it's also the excretion of medications, sometimes unchanged or even unchanged in active metabolite form, in urine and feces. 

YUMMY!