USADA wouldn't have taken part in it and also would have blown the whistle.

USADA | U.S. Anti-Doping Agency. Research, Testing & Education

Do yourself a favour and read up. It's interesting stuff. But again you gotta take your head outta the sand.

Pacquiao has more question marks around him than a quiz book, and he does very little to get rid of those question marks. But then why does he need to when his fans follow him so blindly.