All 22 fighters who participated at UFC 191 on Sept. 5, 2015, passed drug tests administered by Nevada State Athletic Commission (NSAC), according to documents obtained by MMAFighting.com.
Tests for the men in the main event -- a Flyweight title fight between Demetrious Johnson and John Dodson (watch video highlights here) -- were sent to Sports Medicine Research & Testing in Salt Lake City, Utah. Every other fighter had their screens sent to Quest Diagnostics.
Johnson and Dodson were also the only fighters subjected to out-of-competition testing. And both 125-pound standouts passed.
Heavyweight veteran Frank Mir had requested a therapeutic usage exemption for Adderall from the NSAC prior to his co-main event fight with Andrei Arlovski. The request was denied, however, as Mir was late in applying according to UFC vice president of Athlete Health and Performance Jeff Novitzky.
Mir nevertheless passed all drug tests.
For complete UFC 191: "Johnson vs. Dodson 2" results coverage, including play-by-play updates, click here and here.