Drug testing in the UFC was effectively the wild, wild west when Georges St-Pierre first walked away from the sport in 2013.
Back then, in the era of testosterone-replacement therapy, out-of-competition drug screening was nonexistent and commission-mandated testing was generally viewed as an IQ test more so than anything else. But all of that changed in July 2015 when the UFC and the United States Anti-Doping Agency (USADA) partnered to create one of the most comprehensive drug-testing programs in all of sports. Ever since, failed drug tests have become commonplace in the UFC while the number of suspensions handed out by USADA has ballooned with each passing month.