Boxing's 4 Most Infamous Cheaters of All Time | News, Scores, Highlights, Stats, and Rumors

Prior to the 2009 Shane Mosley-Antonio Margarito fight, Mosley's trainer Naazim Richardson was in Margarito's dressing room so he could observe Margarito's hands getting wrapped prior to putting on boxing gloves.

As Margarito's trainers were wrapping their fighter's hands, Richardson noticed what appeared to be a Plaster of Paris powder on the wraps (source: London Mirror). The Plaster of Paris hardens when it comes into contact with moisture, and any fighter will sweat during the course of a fight.

As soon as Richardson saw the substance, he accused Margarito of fighting with loaded gloves. Margarito's hands were rewrapped and Mosley hammered Margarito.

However, in a previous fight, Margarito had been victorious against Miguel Cotto. By the end of the fight, Cotto's face was cut and bruised badly. When Cotto heard what had been discovered by Richardson, he accused Margarito of fighting with loaded gloves.