Boot him from the UFC.
Cheaters have no place, under any circumstances, in any professional sport.
Whoa, whoa, whoa wait a second here. Are you saying that any fighter that takes a drug that is on the banned substances list by the Nevada State Athletic Commission should be dropped from the UFC?
Labeling someone a cheater because they took a banned substance is a lot different than someone who is using a performance enhancing drug.
Smoking marijuana ala Nick Diaz is not a performance enhancing drug. If anything, THC in weed slows ones reaction time and would thus hinder a fighter's ability to fight.
I realize Thiago Silva was not smoking weed, but I'm using the Diaz example to show my point that there is a big difference between performance enhancing and banned substances.
At this point in time we do not yet know what the banned substance is.
Furthermore, I do agree that performance enhancing drugs should not be allowed in the UFC and fighters who choose to use them should be punished accordingly. However, labeling someone as a cheater just for using a banned substance is not justified. They broke the rules yes, but what advantage do you really gain from some substances.
We need to know the exact substance before we can continue this debate in my opinion.