 In "Send in the Clones", Matt Parkman was able to stun Rene with a gunshot next to his head which caused an intense ringing in his ears.While disoriented, Rene was unable to use his powers and Matt was able to use his telepathy on him.Apparently he also has a passive ability to telepathically let everyone know that he is in fact from Haiti, since some characters with no way of knowing that were seen referring to him as "the Haitian".