All 24 fighters tested for prohibited substances in the wake of UFC 167 came back clean, Nevada State Athletic Commission executive director Keith Kizer revealed to MMAFighting.com on Friday.

UFC 167 took place November 16, 2013 at the MGM Grand Garden Arena in Las Vegas, Nevada. UFC welterweight champion Georges St-Pierre edged out No. 1 ranked challenger Johny Hendricks in the night's main event, winning a contentious split decision to defend his belt for the ninth consecutive time, while former light heavyweight champion Rashad Evans steamrolled Chael Sonnen in the night's co-main event.

St-Pierre underwent additional, self-imposed VADA testing throughout the lead-up to fight, largely without the support of the UFC. Hendricks notably refused to take part in the testing, in large part due to a perceived impartiality issue with VADA and St-Pierre, much to St-Pierre's frustration.

Regardless, both St-Pierre and Hendricks, along Evans and Sonnen, were among those tested without incident by NSAC officials.