Nick Diaz ‘s 18-month suspension ended on July 31, making him eligible for a return to fighting for the first time since his UFC 183 headlining bout with Anderson Silva on Jan. 31, 2015. Diaz initially lost the bout to Silva, but the result was later changed to a no contest when both men tested positive to banned substances. Diaz tested positive for marijuana, while Silva tested positive to multiple prohibited substances, including the anabolic steroid drostanolone
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Nick Diaz’s Suspension is Over; Will He Return to the UFC? – MMA Weekly