It's a story that's been told many many many times before.
Marion Jones, Barry Bonds, Roger Clemens, Royce Gracie even, Ben Johnson, Canseco, A-rod, McGuire, Shawne Merriman, Floyd Landis, Ken Shamrock, Barnett, Coleman, Randelman, Chael, 99% of WWE wrestlers, and probably 10% - 25% of all professional athletes at one point or another.
Anything to get the edge as the stakes go higher and higher.
BTW: To everybody and Limba watch "LIMITLESS." You're gonna like it my friend.