On April 10, 2007, the Nevada State Athletic Commission announced that Diaz failed the drug test that was taken shortly before his win over Gomi, testing positive for marijuana. The NSAC declared the fight a "No Contest" and suspended him for 6 months with a fine of 20% of his earnings ($3,000) won from the fight against Gomi. The Commission felt that the result of Diaz's THC test, an enormous 175, was a contributing factor in his performance during the fight. Commission Chairman Dr. Tony Alamo said that while a result of 15 is considered positive, the NSAC has a threshold of 50 for athletes. He also believes they "feel very comfortable that everyone that tests positive in Nevada is truly positive."