Reality that's masked

I think that the MMA(mixed martial arts) is masked. When I used to watch MMA with my dad I thought that it was just jacked guys who knew how to fight really good. I later found out that a lot of fighters used steroids. In every sport I know of steroids aren't allowed and the player would get put on probation/banned. This is surprising to me because MMA has grown a lot in the media over the past few years. With an up and coming sport one would think that steroids would be prohibited. I think that not putting a strict restriction on drug tests is clearly an unfair advantage and it takes the fun out of the sport.
 http://www.mmafighting.com/2014/11/29/7243045/nick-diaz-most-fighters-for-the-most-part-like-their-steroids