The Nevada State Athletic Commission (NSAC) screened all 20 fighters who competed at last month's The Ultimate Fighter 18 Finale for banned substances, and all test results came back negative, NSAC officials told MMAFighting.com on Monday.
The Ultimate Fighter Finale 18 took place on November 30, 2013 at the Mandalay Bay Events Center, in Las Vegas, NV.
Former TUF 5 winner Nate Diaz settled his rubber match with fellow castmate Gray Maynard in the night's main event, blitzing his way to a decisive first-round TKO to end a two-fight losing skid.
The remainder of the night's main card featured match-ups between contestants of The Ultimate Fighter 18, the long-running reality series' first co-ed season.
Chris Holdsworth submitted David Grant via second-round rear-naked choke to emerge victorious out of the men's bracket, while Julianna Pena earned a TKO stoppage over Jessica Rakoczy with one second left in the opening frame to became the UFC's inaugural women's TUF champion.