#4 Chael Sonnen
Chael Sonnen is hands down one of the most entertaining fighters out there. His trash talking skills and fighting style are two things that many fans admire. However, Sonnen’s resume has some major black marks due to his PED busts. In fact, it was his multiple drug test failures that ended his career in the UFC.
Sonnen failed two random drug tests during his run in the UFC and in the second one, he tested positive for four banned substance. Also, one of the tests revealed that Sonnen had 16 times the normal amount of testosterone in his body. Sonnen announced his retirement from the sport due to the failed tests and he also had his UFC analyst position taken away.
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In 2014, he was banned for two years by the NSAC as a result. Sonnen served the suspension and came out of retirement in 2016 by signing with Bellator MMA. He fought four times in the promotion and won two times.