Brock Lesnar tested positive for a banned substance by USADA right before his fight at UFC 200.
It appears obvious that Lesnar knew exactly what he was doing. He did not test positive in any of the tests that the results of which came back long enough before the fight for the fight to get canceled, in which case he wouldn’t have gotten the money for the fight. Instead, he took the banned substances for which he tested positive only when he knew that the results of the tests would come back after the fight, fought and got the money for the fight.
The question is, what should be done in order for that not to happen again in the future.
The situation now is that fighters who test positive for banned substances get suspended from fighting. This is, of course, a good solution for most fighters, for whom fighting is their main career. By suspending them from fighting, they don’t get to pursue their goal of an MMA career (at least for a while); they don’t get the opportunity to continue being involved in competition and their livelihood is taken away from them for a period of time.
But for some fighters, an MMA career is not their goal anyway. They are in for one big payday. It happened before (James Toney), and it has never been more clear than this time with Brock Lesnar.