I tend to give players the benefit of doubt. You are saying damn near 100% of Patriots are on illegal substances?
No need to subset it out as if the team we support is somehow more righteous than another.
Yes I assume that most professional athletes are on some form of performance enhancing substance; be it HGH, steroids or something we haven't even heard of yet. There is literally no one in American Professional sports that would surprise me; Not Brady, Not Jeter, Not any other "transcendent player who seems like a really great dude who I want my kid to look to".
And I don't say that to besmirch their character. I simply look at it and say "people don't get that big by eating clean protein and lifting weights" and "people don't come back from catastrophic injuries in such a short amount of time simply through rest and the will of god".
Sports is big bidnass and puts the players in a "perform or die" situation; I certainly don't blame or think less of them if they do something.
But just like with Pre-Employment and Probation drug testing, just because people pass, doesn't mean they aren't dabbling.
You are free to disagree.
EDIT TO ADD - I am a Programmer/IT Consultant by trade. If there was a drug available that would make me better at it and by being better at I could double/triple or my earnings potential you bet your ass I would take it (sure, maybe that's Adderall in my case).
And my career earning potential is a fraction of these guys.