In the past, many current and former fighters have claimed that a relatively high proportion of fighters use steroids, but because of the predictable testing schedule and the relative ease of cycling off the drugs, a low percentage of these users actually get caught. For this reason, it wouldn't surprise me if GSP (and a lot of other fighters) were on roids.
That being said, you can't just claim that someone is on roids with no proof of the matter, and because of GSP's clean past, everyone should take GSP at this word that he doesn't use roids and should continue to believe him unless somethign concrete were to surface.
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