I think he has nothing to lose, he cheated before he can do it again. Once a cheater will always be a cheater. Its a habit that will never go away.
If margarita had his way...he'd probably demand random blood tests, but he knows uncle Bob wouldn't allow it...in other words...no pay day...
Once a man has shown that He will sacrifice his integrity, there's no turning around, specially if He has never accepted wrong doing as Margarito.
Pacquiao deserves the benefit of the doubt because He unlike Margarito has never being caught cheating.
I would watch the cheater like a Hawk if I was Pacquiao.