NAC: No Conspiracy in Anderson Silva Drug Test; Lab Protocols Delayed Results February 04, 2015 (23:30) [ Indexed from Sherdog.com ] Anderson Silva tested positive for two anabolic steroids during a pre-fight drug screening on Jan. 9, but because the result did not arrive before UFC 183, the ex-middleweight champion was allowed to compete with performance enhancing drugs in his system on Jan. 31. More...