The problem is that the athletes have figured out how to take PED’s in a largely undetectable fashion. Many of them start early in their careers, even as early as high school. Even if, starting a college career, that they started testing and the players stopped using, most of the gains have already been made.
Lyle Alzado, quoted from a Sports Illustrated article shortly before his death:
" I started taking anabolic steroids in 1969 and never stopped. It was addicting, mentally addicting. Now I'm sick, and I'm scared. Ninety percent of the athletes I know are on the stuff. We're not born to be 300 lb (140 kg) or jump 30 ft (9.1 m). But all the time I was taking steroids, I knew they were making me play better. I became very violent on the field and off it. I did things only crazy people do. Once a guy sideswiped my car and I beat the hell out of him. Now look at me. My hair's gone, I wobble when I walk and have to hold on to someone for support, and I have trouble remembering things. My last wish? That no one else ever dies this way."
As a footnote, I lost a close friend, one of my "gym rat" buddies to steroid induced cancer about 15 years ago. Not a pretty thing.
(Rest in Peace, Big Mike.)
10 years ago the best players on my sons high school team were using performance enhancing drugs.....and the coaches knew. They ignored the drug use because winning was the single most important thing in the coaches lives.