Typical signs: Looks/appearing ripped randomly, Looking unbeatable/washed up/unbeatable, joint injuries, ties to PED docs, frequent leaves of absence for injuries but they're actually using that time do their PED of choice etc
Tiger Woods 99% sure
Serena Williams 99.9% Chance
Rafa Nadal 95%
All make Jersey Shore guys minus Vinny 98%
Here's Pauly D caught off the juice pretty lol
The Rock /Mark Wahlburg 100%
Johnny Hendricks 70%
UFC Ferita 95%
Paul Tuttle sr 95% Had ped's sent to house or some shit, google it
Usain Bolt 99%