MMA light heavyweight Chael Sonnen was getting ready to fight in UFC 157, until he tested positive for TRT, Testosterone Replacement Therapy, a substance that used to be completely legal until the Athletic Commission changed the ruling banning the substance.
Sonnen claims that, "although this is a banned substance on fight nights, it is also a substance that helps him live a healthy life," Sonnen claimed in an interview on ESPN.
His plan is to appeal the test stating that it is legal to use anytime besides fight night. However, UFC has a right to randomly screen all of its fighter whenever they see fit.
Currently Sonnen doesn't know if or when he will ever be able to fight for UFC again.