Of course I can't back it up, do I spend 24/7 with any of these people, no. NOBODY can back it up.
All I can do from the bleachers is notice when people look unnatural to me. For example, Allyson Felix, who has been fast since she was very young, looks naturally ripped, but not in a crazy way. Pharmalita does not. That said, could Felix be dirty? Sure, but I am way more suspicious of Pharmalita.
It is possible for most people to get pretty ripped through hard work. But I am not talking about pretty ripped. I'm talking about insanely ripped women with manjaws. To me, someone like Jenny Simpson looks fit, but Morgan Uceny looks wrong. All just my opinions.
After all the athletes who have failed drug tests, I don't even know how people can say shit like "Back it up" with a straight face. Elite athletes are all under suspicion, unfortunately.