“Thiago Silva tested positive for marijuana metabolites following his bout at UFC on FUEL TV in Macau,” read a statement from UFC officials. “The UFC organization has a strict, consistent policy against the use of any illegal and/or performance-enhancing drugs, stimulants or masking agents."
Silva initially scored a third-round submission victory over Stanislav Nedkov at UFC on Fuel TV 6, but the bout has since been ruled a “no contest” due to the positive drug test.
“Silva has admitted to taking the banned substance and has agreed to participate in an approved drug-rehabilitation program and serve a six-month suspension retroactive to the November 10 event," the UFC statement read. "He must pass a drug test upon completion of the suspension before receiving clearance to fight again.”