I don't think all have; in response to your thread. Lamont Peterson Andre Berto Both fighter's got beat; Lamont by Timid Timmy (and one could say by Khan as well) and Andre by Victor. Then they decide to put **** in thier systems and stall the rematches.. I say forget USADA, VADA is the way forward.
The NSAC and commissions from other states should partner with VADA for testing for all championship fights in their states. They could establish policies for frequency depending on the purse with the promoters sharing the costs with the fighters and commission.