I know 90% of those athletes dope. Its just apart of the game sadly, its unspoken in the world of professional sports. I'm completely against it and refuse to believe they do and keep telling myself that they don't dope, but knowing damn well majority of all of them do in some sort of shape or form. Its across all sports! Predominately American football, Boxing/MMA, Baseball, and football.
When I trained with FC Dallas's first team back in my youth about 4 years ago in the development academy, I witnessed in person a couple of the players literally injecting hgh into themselves, along with test-e.