Testing issues could derail Mayweather-Pacquiao - Boxing - Yahoo! Sports Well known fact he does not like blood tests and won't take them BEFORE a fight. Also well known he has NEVER tested positive for any banned substance. Merryweather is playing a head game. He knows the shit bothers Pacman so is insisting on it to get in his head. Pacman has offered to test one month before the fight and has even offered to test right AFTER the fight. Pretty damn cheap trick by Merryweather. I hope Pacman refuses.