No. 1 featherweight contender Chad Mendes believes that 80% of UFC fighters are using performance enhancing drugs which are banned drugs. According to his interview with Sherdog "I'd probably say at least 80 percent of fighters are probably taking something." He added "You know, there's guys that are coming back from injury trying to take it. Whether it's them trying to survive, pay their mortgage, pay rent or whatever - or guys just trying to get that full advantage to be at the top. So yeah, I think there's a lot of people taking performance-enhancing drugs."

The 29 year old fighter has an MMA record of 17 total fights with 16 wins and 1 loss. Six of his wins came by knockout while two were by submission. As of January 17, 2014, he is #1 in official UFC featherweight rankings and ranked the #2 featherweight in the world by Sherdog.

Although UFC president Dana White insist that the MMA and UFC does not have rampant PED drug abuse but comments given by fighters are painting a different image for the sports. Currently, UFC is conducting random drug tests to their fighters to ensure that players are on their top shape without the user of PEDs.

With regards to this, Mendes says "I like [random drug testing]. The only thing I question about the system is what do we do about guys that are out of the country? Guys in Brazil, guys in Japan, can we trust those random drug tests?"

He added "I was thinking about this the other day: If someone were to knock on Aldo's door in Brazil and say, 'We need to give you a random drug test,' and he says 'Here's $1,000, go away,' it's done. I feel like something like that could happen very easily. I just want to know what the system would be -- how could we trust that it's going to be fair everywhere?"

For now, Mendes is contemplating about his next opponent - champion Jose Aldo. Aldo postponed his fight with Mendes due to an injury. Aldo also accused Mendes of using PED which got the ire of the latter.