the ufc does random testing,pride does not test at all,...but they are all on it anyway...when you are at that level you have to be to be competetive...its just like the nfl...you wanna be your best and competetive so they are all on it...even when i was a amateur 90% of the fighters i met were on it.
even the fighters that have sloppy builds and dont look like they use are on.look at tim sylvia in the ufc...he tested positive and he looks like shit!...tito ortiz chin has grown alot in the past few years from his hgh use...i have met many pros at fights and after party's,and some will even openly discuss there use around other fighters.
its just a part of most profesional sports now bro!