Vitor Belfort failed a post-fight drug screening after Pride 32 in 2006. After losing a decision to Dan Henderson, Belfort's test came up positive for 4-Hydroxytestosterone. Belfort claimed that he received injections for a damaged knee that may, not to his knowledge, have had testosterone in them, yadda yadda you know the way these things go. The 35-year old was recently interviewed by ESPN. Belfort has been saying he's in the best shape of his life and ESPN wanted to know if that was the result of taking Testosterone Replacement Therapy (TRT) like many other MMA fighters have recently, mostly through legal avenues. http://espn.go.com/blog/mma/post/_/id/15993/ageless-belfort-believes-hell-overcome-bisping
In other words, yes. I am not a fan of Vitor, I just can't get into him. He's kind of in the same spot Rich Franklin was. He can hold his own at 185, but once he runs back into Anderson again (if he does), he'll just get KO'd again.