I really hope not, but wouldn't be surprised. His accomplishments are incredible, almost unbelievable, so I understand why people question his cleanliness.
2X early in his career when he was drained and malnourished. 1X by super roided Marquez. He ate insane flush nukes from Cotto, Thurman, and Margarito.
Yeah, Chin never seemed to be an issue with Pacquiao, plus i think the the loss earlier in his career was a body shot.
We saw his durability without loaded gloves when Sugar Shane Mosley ****ed him up good and proper then both Pacquiao and Cotto subsequently ****ed him and blinded him in one eye.