The US Anti-Doping Agency (USADA) has confirmed that Floyd Mayweather and Manny Pacquiao will take part in drug testing before their May 2 megafight.

As part of the rules established under the World Anti-Doping Code, the World Anti-Doping Agency (WADA) Prohibited List and the USADA Protocol for Olympic and Paralympic Movement Testing, the fighters are subject to both blood and urine testing at any time.

Those samples will be tested for human growth hormone (HGH), erythropoietin (EPO) and utilising carbon isotope ratio (CIR).

"It's a strong statement of the importance of clean and safe competition to have these two fighters voluntarily agree to have a WADA-level anti-doping program implemented for this fight," USADA chief executive officer Travis T. Tygart said in a statement.

"We commend them for their stand for clean sport and the message it sends to all those who want to compete clean at the highest levels of all sport."

What was not mentioned in the release from USADA is the four-year ban that comes along with a dirty test, which would be crippling to the 38-year-old Mayweather or 36-year-old Pacquiao. 

Mayweather and Pacquiao have been at odds over testing in the past. Mayweather first asked for USADA testing before his May 2010 fight with Shane Mosley after Pacquiao refused blood testing.

Shortly after, Mayweather accused Pacquiao of steroid use in the form of "power pellets".Pacquiao sued Mayweather over the comments and eventually agreed on a $5million settlement.

This new agreement should put to rest any accusations.