It doesn't need to be proven because this isn't court, its public opinion. We're free to use our logic to form these opinions.

After YEARS of toiling in the underground, Marg finally becomes a mainstream figure in the boxing world and is making big paydays. He just destroyed one of the most feared fighters in the sport, he's on top of the WW division, and NOW he's going to risk it all by cheating? Doesn't sound right to me. He would not have tried to do this unless he was fairly sure he would get away with it, which not only attests to the incompetence of the NSAC but also suggests success in the past.

If you guys want to shut your brains off and take the word of the guy who is desperately trying to cover his ass, by all means go ahead.