According to news broken by mmajunkie.com, two drug tests from UFC 149 in Calgary came back positive from the samples taken.
The two fighters who tested positive for banned substances were bantamweight striker Francisco Rivera and welterweight grinder Matt Riddle.
It is reported that Riddle, who fought on short notice for Siyar Bahadurzada, failed his drug test due to marijuana in his system. At the event, he defeated Chris Clements in a Submission of the Night performance that saw him call out Dan Hardy after the event.
As for Rivera, he reportedly failed his drug test for an "undisclosed, over-the-counter stimulant." His win at UFC 149 saw him brutally knock out Roland Delorme in an early contender for Knockout of the Night.
The punishments were reported as followed.
Both fighters were suspended for 90 days retroactive to the July 21 event, which makes them eligible to fight on Friday. The results of their respective bouts were not changed.
So, despite receiving respective suspensions for their mistakes, their wins were not erased like Jake Shields' win over Ed Herman at UFC 150 was recently.
These recent drug test failures cement the logic behind constant drug testing in MMA. Although Riddle and Rivera were not caught with performance enhancers or steroids, they still did wrong and broke the rules.
Both men were apologetic and will not appeal their suspensions.