They're just doing it better than everyone else. It's likely managed and optimized better at places like Bama and Clemson.
I would be afraid to know what % of CFB players use PEDS. It's certainly nothing new. Nebraska in the 80's and 90's and USC under Carroll are just a couple of examples of winning programs that got away with it without consequence.
Hell it's even become commonplace at some high school programs (which certainly doesn't make it right). It's difficult to test everyone, and clearly some schools are very good at "avoiding" positive test results.
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