Damn - this is going to fuel the fire...a lot:
Employees of the U.S. Anti-Doping Agency who arrived to give Mayweather a random drug test after the fight’s weigh-in “found evidence of an IV being administered” to the boxer. Nevada State Athletic Commission executive director Bob Bennett told SB Nation that USADA did not clarify to the NSAC whether Mayweather was receiving an injection when the collection agents came to his home. According to Mayweather’s medical team, the fighter was given two different vitamin mixes to treat dehydration. While the injections did not include any banned substances, IVs are still banned under WADA guidelines because they can be used to “dilute or mask the presence of another substance,” Hauser explains.
Check out the SB Nation article detailing it out in full - here's a fun snippet:
Mayweather’s medical team also told the collection agents that the IV consisted of two separate mixes. The first was a mixture of 250 milliliters of saline and multi-vitamins. The second was a 500-milliliter mixture of saline and Vitamin C. Seven hundred and fifty milliliters equals 25.361 ounces, an amount equal to roughly 16 percent of the blood normally present in an average adult male.