And sure enough, Cushing got busted in the league and had to sit a few games.
I have a friend that was an S&C coach at the University of Utah for a couple of seasons but recently got on with the University of Hawaii (kind of followed Norm Chow over there).
I asked him about this very topic a while ago and he gave me some good perspective on it. The guidelines for the supplements that are provided by the university are very stringent--to the point that basic things like protein have to be certified. Basically, if athletes are taking PEDs, they're doing a good job of keeping it under the radar. I'm certain that there are players on the juice, but he couldn't validate that or refute.
He also mentioned a couple of players that he was assigned to while he was a GA that he would have to call every 3 hours to ensure that they were eating and tell them exactly what to eat. In one case a player under his guidance gained about 20 lbs during the off season and this kid was a bean pole coming in.
My personal experience, after I graduated HS and had more time to commit to the gym and nutrition I gained 30 mostly solid pounds over the course of about 6 months. The only things I took were creatine, NO2 and protein with a well balanced diet. It was just a matter of maturation for me as I peaked at about 245 by the time I was 23...
My overall sentiment is that juice is prevalent in collegiate athletics but there are also people that just grow into their "man" bodies during their late teens/early 20's.
Not popular opinion but I view PEDs as part of the evolution of sports...much like equipment evolves (golf clubs, bats, etc...) players also find ways of gaining a competitive advantage and ways to stay ahead of the latest testing methods. With the amounts of money that can be at stake, I can understand why.