More often then not it is the loser of the fight who tests positive for steroids. Also there is no drug testing in Japan or the UK for that matter so to say the fightersare juicing is strictly speculation.
I do know for a fact though that the UFC's LW champ tested positive for steroids as well as his opponent. SO has TIm SYlvia while he was HW champ, so did Josh Barnett who was also HW chmp at that time.
I would say that there are alot more UFC fighters juicing then ther are Pride fighters. Except for anyone who has ever fought with Hammerhouse, i'm about %100 sure they all do roids
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Up with hope, and down with dope.