Should one of them fail, they will be sentenced to a four-year ban from boxing.
The L.A. Times has it:
USADA Chief Executive Travis Tygart told the Los Angeles Times the agreement will give his agency full access to conduct unannounced in- and out-of-competition blood and/or urine tests of the fighters at any point through fight night, May 2, at the MGM Grand in Las Vegas.
“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. 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,” Tygart said.
Most seriously, Tygart said each fighter has agreed to stipulations of the World Anti-Doping Agency code, which calls for a four-year ban from competition for any athlete who tests dirty.