There is evidence that testing gets beaten a lot but to say that everyone that passes tests just "beat the system" with no other evidence to claim 100% of fighters are on steroids is bullshit.
If 30-55% of fighters were on steroids after what I have learned and researched this year would not surprise me but to claim it with no evidence other than paranoid fighters say 90% ish of the roster is on steroids is just rich. Also steroids do not make you able to beat a skilled non enhanced fighter if you do not have the skills for it.