All 22 fighters underwent drug testing at The Ultimate Fighter 16 Finale earlier this month, and all tested clean for performance-enhancing drugs and recreational/drugs of abuse.

Nevada State Athletic Commission Executive Director Keith Kizer today e-mailed the drug-testing results to MMAjunkie.com (www.mmajunkie.com).

The TUF 16 Finale took place Dec. 15 at The Joint at Hard Rock Hotel and Casino in Las Vegas. The main card aired on FX following prelims on FUEL TV and Facebook.

In the headliner, Roy Nelson, who also underwent voluntary VADA drug test prior to the bout, scored a TKO victory over fellow heavyweight Matt Mitrione. Mitrione was a replacement for injured Shane Carwin, who served with Nelson as head coaches on “TUF 16.”

In the co-headliner, Colton Smith won the latest season of the UFC’s long-running reality series with a shutout unanimous-decision win over fellow welterweight Mike Ricci.

Nelson, Carwin, Smith, Ricci and the rest of the fighters tested negative for drugs of abuse (such as marijuana and cocaine), as well as anabolic steroids and other performance-enhancers.

The NSAC traditionally tests both main-event fighters, all winning fighters and any competitors who previously failed drug tests. However, some of the testing remains random, and all fighters are subject to it.

For complete coverage of the The Ultimate Fighter 16 Finale, check out the UFC Events section of the site.

(Pictured: Roy Nelson)