floyd used banned substance before

[ElTerribleMorales]

So what your saying is its ok for Mayweather to use xylocaine because NSAC allows it even when its illegal in other states. But its totally ok to disregard NSAC rules when it comes to drug testing. How convenient.

there's a big difference between using a legal substance allowed by the sanctioning body and using an illegal substance that the urine tests done by that sanctioning body don't detect

I'm fully aware of the differences. Again, xylocaine is legal in the state of Nevada but illegal in other states. But my point is about the rules and regulations.

NSAC has a rule and your stuck with it. If you follow some rules you like then great. But if you don't like the other rules then petition for it to be change. But unless its change everyone should abide by the rule of the sanctioning body.

PED's and any other steroids are illegal in all 50 states....
and where was the Pacquiao/Mayweather fight gonna be held? oh right Nevada, the state where xylocaine (an anesthetic) is legal