Tim Kennedy continues to fire at Vitor Belfort for his supposed performance enhancing drug (PED) usage over the past few years.

The UFC middleweight has been clear about his stance regarding PEDs since they became a public concern in the sport of MMA. He believes that much is changing in the testing procedures now that will favour clean fighters, as the testing has become more stringent and randomly assigned.

"So guys have definitely been on it for a really long time on a whole bunch of different stuff," Kennedy told Submission Radio. "You know, if you ask every single fighter, every single guy if they've ever been blood tested, the vast majority of them will say no. The stuff that they're catching these guys on are things that you could only find with blood tests. So you know, only recently in the past few months have we tested guys you know, for HGH, EPO, you know stuff that you could only find in the blood, and ironically those guys that they test keep failing. So it's definitely been there and there's not like there's an increase of it, it's just (that if) you're testing for it you're going to find it, and a whole bunch of guys are using it, and a lot more than they've found."

In his second failed drug test this year alone, former two-division title challenger Chael Sonnen had tested positive for both human growth hormone (HGH) and recombinant human erythropoietin (EPO), both of which are clear performance enhancers that cannot be found in a urine test. His is just one of the several examples of failed drug tests in 2014 alone.

"What can we do it about it? Well, test. Test, test, test more guys. Like, you know they've tested like six or seven dudes; Jon Jones, Texeira - both of those guys came back clean - Demetrious (Johnson), Ali (Bagautinov) both tested, Demetrious came back clean Ali did not, Chael failed obviously, Wanderlei ran from the athletic commission guy that came in to take the sample, Vitor Belfort failed, you know these are reoccurring themes here that if you're going to test guys, their gonna fail. So you have to test more of them to really understand where the issue is and how many guys are doing it"

Kennedy directed his concerns at Vitor Belfort, whom he believes has been a consistent PED user for years now, and has stayed under the radar because commissions were not stringent with blood testing.

"Right now he's down in Brazil, or back in you know California, training his butt off and injecting anything that he wants to and loving it, and nobody's testing him, or like his doctor - when I say his, I'm making quotation fingers "doctor" - so he's like dripping testosterone out of his eyeballs right now, how old was he when he first failed a drug test, like 18? For anabolic steroids? So he's being using for 20 years. Your body doesn't function naturally now. - He's what, 37 or 38? So like 18 years -But there's no possible way that he could compete at a high level against the Chris Weidmans, the me's, the Luke Rockholds without chemically enhancing himself. There's no way. I don't care if he's like, drinking Jesus' blood like he says he is or whatever, it doesn't work that way. Like, he's been using steroids for like 15 or 20 years, and he still is using them. If he ever tries to get clean, he can't compete at this level."

Transcription taken from Submission Radio.