Both fighters were under the CPB I believe - all top 15 WBC ranked fighters are as are all elimination fights. VADA handles the CPB side, UKAD tests for all major fights under the jurisdiction of the BBBoC as a matter of course.
— Eddie Hearn (@EddieHearn) July 24, 2019
Further to reports I can confirm that both Dillian Whyte and Oscar Rivas were subject to extensive VADA and UKAD testing for their bout. Both fighters were cleared to fight by both bodies and the BBBofC
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