The build-up to his welterweight title fight against Andre Berto was been rocked on Thursday by reports of the alleged violation.
According to a report in SB Nation, Mayweather allegedly received an intravenous injection of saline and vitamins that was banned under World Anti-Doping Agency guidelines, on the eve of his bout with Manny Pacquiao in Las Vegas on May 2.
However, Mayweather said in a statement he “did not commit any violations” and he was fully supported by the US Anti-Doping Agency (Usada).
“As already confirmed by the Usada statement, I did not commit any violations of the Nevada or Usada drug testing guidelines,” said Mayweather, who beat Pacquiao on a unanimous decision to improve his perfect record to 48-0.
“I follow and have always followed the rules of Nevada and Usada, the gold standard of drug testing.
“Let’s not forget that I was the one six years ago who insisted on elevating the level of drug testing for all my fights. As a result, there is more drug testing and awareness of its importance in the sport of boxing today than ever before.”
According to the SB Nation report, Usada collection agents visited Mayweather’s house in Las Vegas the night before the fight on May 2 to conduct an unannounced drug test. They discovered that he had been given an intravenous injection for rehydration purposes.
The substances in the IV were not banned by Wada, but for them to be given intravenously was not permitted, the report said.
Mayweather was given a retroactive therapeutic use exemption (TUE) by Usada only 19 days later.
“We believe it is important to immediately correct the record regarding the false suggestion that Floyd Mayweather violated the rules by receiving an IV infusion of saline and vitamins,” Usada said in a statement on Thursday.
“As was already publicly reported in May this year by the Nevada State Athletic Commission, Mr Mayweather applied for and was granted a TUE by Usada for an IV infusion of saline and vitamins that was administered prior to his May 2 fight.
“Mr Mayweather’s use of the IV was not prohibited under the NSAC rules at that time and would not be a violation of the NSAC rules today.”
The Usada statement said reports on the controversy contained a “multitude of errors” and were “riddled with significant inaccuracies and misrepresentations.”
According to Usada, both the NSAC and Team Pacquiao were notified about the TUE after it was granted, “even though the practice is not prohibited under NSAC rules”.
Over the past six years, Usada has conducted anti-doping programmes for more than 45 fights in professional boxing, all of them conducted in accordance with the Wada Code and the International Standards.
“As a result, every athlete who has participated in one of our programmes has voluntarily agreed to abide by the rules of the Wada Code and willingly subjected themselves to substantially more stringent testing protocols than they otherwise would have been subject to,” Usada said.
Mayweather will put his unbeaten record on the line when he defends his WBC and WBA welterweight titles against fellow American Berto in Las Vegas on Saturday night