1. Ken Shamrock
Frank Shamrock once said that his brother Ken had been on steroids for his entire life, and he might be right.
Shamrock would appear on Inside MMA with Kenny Rice and Bas Rutten in 2014 where he admitted to using steroids, but denied having ever competed while using steroids. Leave it to Shamrock to make an implausible sounding denial even as he is admitting to something.
Shamrock tested positive for steroids stemming from his defeat of Ross Clifton at a WarGods event in 2009. The win would have been his first in five years. He also tested positive following his Bellator 138 loss to Kimbo Slice.
