So Anderson Silva failed his random test 3 weeks before fight night last year, and there was a huge backlash that he was allowed to fight dirty. Turns out USADA tested Tibau 2 weeks before he fought in Brazil. How long should it take to get results of random tests back, especially if there's a fight looming? http://ufc.usada.org/gleison-tibau-accepts-doping-sanction/ "Tibau, 32, tested positive for erythropoietin (EPO) following both out-of-competition and in-competition tests conducted on October 23, 2015 in Coconut Creek, Florida, and on November 7, 2015 in Sao Paulo, Brazil, respectively. EPO is a synthetic hormone used to stimulate the body’s production of red blood cells, thereby increasing oxygen transport and aerobic power, and is a prohibited substance in the class of Peptide Hormones, Growth Factors, Related Substances and Mimetics under the UFC Anti-Doping Policy."