Nobody knows for sure yet and the B sample wont even be ready until after the fight. The reason people are suggesting that it might be Clenbuterol is because Morales is talking about tainted meat. The same reason given by a bunch of soccer players from the Mexican National tournament and they were acquitted. Apparently over a hundred players in an under 17 tourney in Mexico had the same thing happen so he could get away with it if it turns out to be that diuretic.