So what are the banned substances?

[killersheep]

So that leads to the next logical question how does the WADA determine how to check for banned substances?

An exhaustive list on testing criteria is listed here:
http://www.wada-ama.org/Documents/Wo...ng_2009_EN.pdf

Reasons for testing includes:

from 4.4.2

reason e) Behaviour indicating doping
reason f) Sudden major improvements in performance
reason m) Financial incentives such as prize money, or sponsorship opportunities.

You can make the argument that this applies to most of if not all major prize fighters at some point in there careers, to which I would agree.
So why not set an example with the biggest potential fight of our time?