Would everyone leave Antonio Margarito alone? The guy had to rush from his second job as a craftsman, putting some finishing touches on a bathroom in Santa Monica, just to get to the Staples Center on Saturday night, which is why he looked so flat. He didn't have time to wash off his hands, which explains the "plaster like substance" found in his wraps.
The substance was found before the fight, so he was re-taped under the supervision of a boxing official. Then, coincidentally, the Tijuana Tornado got his ass handed to him by a 37 year old "Sugar" Shane Mosley. Boxing gloves weigh about 12 oz, and I'm guessing a handful of plaster is going to increase that pretty significantly.
That was Cotto's first career loss, and it looks a whole lot different after the revelation that Margarito was cheating. You might doubt whether Margarito used the plaster in his 11th round defeat of Cotto, but ask yourself this: Why would you win the Welterweight title and THEN start cheating?