Peterson didn't just agree to do the testing, it was him who asked for it to be done!
I know everyone still moans at Khan about just sucking up and taking that loss on the chin. Lets be honest here, Peterson is just a f**k off cheat. That whole fight was a joke, he was also drugged up for it!
I hope they strip him of the titles, hand them back to Khan and mark the fight as a no contest. At least let Khan lose them to Floyed, fairly and in style!