I'd bet there's not a single star athlete in any sport that hasn't used performance enhancing drugs in some way. Test doesn't just make your muscles grow; it allows you to train harder and recover faster. The benefits are obvious. Stars have been caught in nearly every single sport you can think of -- football, baseball, track, cycling, distance running, sprinting, swimming, weightlifting, bodybuilding (well, they mostly don't bother testing), etc. Even movie stars are doing them (see eg Hugh Jackman jumping 20 lbs lean muscle mass in 6 months in his 40s to play Wolverine.)
Where stars aren't getting caught testing is lax or the drugs have outrun the testing regimes (basketball, crossfit, tennis).
In the year 2016, believing that the best athletes aren't using the same drugs as everyone else requires willful suspension of disbelief. After all, look at what they did for eg Barry Bonds -- they turned a clear hall of fame player into probably the best to ever play baseball. Every star athlete, and they tend to be ultra competitive, wants the same thing.
What's more, anabolic steroid use causes long term changes to muscle by increasing number of myonuclei (this also happens with natural training, but less effectively). Myonuclei are not lost even after long term muscle atrophy, so it's much easier to regain lost muscle size ("muscle memory"). You keep the benefits long after your cheating has become impossible to prove.
Where stars aren't getting caught testing is lax or the drugs have outrun the testing regimes (basketball, crossfit, tennis).
In the year 2016, believing that the best athletes aren't using the same drugs as everyone else requires willful suspension of disbelief. After all, look at what they did for eg Barry Bonds -- they turned a clear hall of fame player into probably the best to ever play baseball. Every star athlete, and they tend to be ultra competitive, wants the same thing.