I'm loling right now because I remember having this exact same debate with Raineer and Stilgar almost a year ago. They were so certain that Rasp wears off over time, and when challenged to go test for themselves, stated their intentions to do so, and then abruptly abandoned the topic and never spoke of it again.
(Edit: Nevermind I found the old topic just now, and Stilgar did eventually test it)
XI Wiki

