Yesterday, the Nevada State Athletic Commission suspended Nick Diaz for five years and fined him $150,000 for failing a drug test after his January bout against Anderson Silva. Diaz tested positive for marijuana metabolites. His opponent tested positive for anabolic steroids and was suspended one year. The asymmetry between these punishments is not as clear as it may seem: Diaz has tested positive for marijuana twice before, in 2007 and 2012. That might be because he has a medical card in California, where he lives, but whatever the reason, Diaz smokes a lot of weed. As of yesterday afternoon, that seems to be the central problem in his life.