Ok now let's talk logic.
Mayweather passes test prior to the IV. What type of PED could Mayweather take or mask the day before that would actually have an affect on the fight?? Victor Conte (who has ties to VADA and publically bashes USADA every chance he gets) admits that PEDs takes at least 3 weeks to get into your system/blood stream and another week to actually have any affect. So on average, Floyd would've had to have taken PEDs at least 30 days out to have any affect on the fight. If he did take something after the weigh in or the day before the fight, it wouldn't have meant **** towards the outcome of the fight because there was no time for it to take affect. Also, there were no failed drug tests before or after the fight from either fighter.
Just to put things into perspective, 750mL of saline and vitamins is what Floyd took via IV. 750mL is roughly 25oz. The average water bottle is 16oz. So 750mL is about a water bottle and a half. That's about 2lbs of fluid (adding the weight of the dissolved vitamins). The avg human being intakes 2,000 - 3,000mL of fluids per day. An athlete could EASILY double that. When dehydrated it is recommended you give the patient 20-30kg. Floyd took 11kg, which means he would've needed to use another bag just to fall in the "doctor recommended" range. Also the IV was used after the weigh in, which is common practice in boxing. It's called rehydrating; much like Oscar did when he fought Pacquiao.