MMARated.com has learned that Joe "Diesel" Riggs has not been medically cleared by the California State Athletic Commission to fight against Luke Stewart on tomorrow evening's Strikeforce event. The last time MMA fans saw Riggs compete, he was forced to tap out to Cory Devela after reinjuring his back at the Strikeforce Tacoma Dome show in February. More as this story develops. Update: MMARated.com has learned that Drew Fickett has been selected to replace Joe Riggs as Luke Stewart's opponent. According to Riggs' agent, Ken Pavia, Riggs was not cleared to fight because he took a prescribed percocet three days ago and while there was a chance it would not show up in a drug test his camp felt it was only right to tell the CSAC. According to Pavia, Riggs' camp was faced with a similar situation prior to his December 2006 fight against Diego Sanchez in San Diego where they informed the CSAC that he took a prescribed drug and nothing came of it. Same commission, different outcome this time around. MMArated.com will soon be posting an exclusive video interview with Pavia where he further explains the situation.