Are you serious? My God...search for Luis Resto and read the story of what he was accused of doing against Billy Collins Jr.
Not just accused, he admitted it in an interview while he was incarcerated for an unrelated charge(at least I think it was unrelated).
I think Luis Resto is the ultimate cheat. Wat a **** As for active boxers it must be Ruiz. All the other cheats at least have some talent, he's a club fighter that made it to the top of his division - WTF ? oh and Margarito almost cheated his way to the top too.