Nick Diaz (Pictures) has tested positive for marijuana following his stunning submission win over Takanori Gomi (Pictures) on Feb. 24, Sherdog.com learned Monday afternoon.

According to Nevada State Athletic Commission executive director Keith Kizer, Diaz is the only mixed martial artist tested on the PRIDE 33 card to return a positive result for a banned substance.

The 23-year-old welterweight from Stockton, Calif. declined to comment on the news. Diaz' manager, Cesar Gracie (Pictures), offered his support to Diaz while saying he does not condone the use of marijuana.

Diaz captured his PRIDE debut versus Gomi, the Japanese organization's 161-pound champion, in spectacular fashion. Afterwards, it was learned that Diaz had suffered a fractured orbital bone and was medically suspended up to six months. While the NSAC has discretion, suspensions for the use of marijuana have been for a similar period of time.