Apparently Whyte was enrolled and cleared by VADA before and after his fight with Rivas. It was UKAD who apparently found something
The British heavyweight, 31, tested positive for a banned substance with UK Anti-Doping (Ukad) in the run up to his points win over Rivas on 20 July.
He was notified of the test on 17 July but cleared to fight by an independent panel on the day of the bout.
Vada conducted multiple clean tests on both fighters from 26 April to 21 July.
Vada operates in boxing and mixed martial arts and requires fighters or promoters to pay for testing for the duration of a fight build-up. It is understood the testing for Whyte's bout with Rivas cost in the region of $28,000 (£23,000).
The organisation is sought out by fighters for additional testing to the work carried out by country-specific agencies such as Ukad.
The Las-Vegas based Vada has earned a glowing reputation in the sport and was responsible for tests which led to the likes of American heavyweight Jarrell Miller and Mexico's Saul 'Canelo' Alvarez facing bans for doping in recent years.
Most recently, Andy Ruiz Jr praised the thorough nature of Vada testing he faced before becoming unified world heavyweight champion in June.
Whyte's failed test with Ukad reportedly took place in late June, around a month before he was notified of findings. Ukad has so far declined to publicly comment on the test and the banned substance has not yet been officially made public.
The British heavyweight, 31, tested positive for a banned substance with UK Anti-Doping (Ukad) in the run up to his points win over Rivas on 20 July.
He was notified of the test on 17 July but cleared to fight by an independent panel on the day of the bout.
Vada conducted multiple clean tests on both fighters from 26 April to 21 July.
Vada operates in boxing and mixed martial arts and requires fighters or promoters to pay for testing for the duration of a fight build-up. It is understood the testing for Whyte's bout with Rivas cost in the region of $28,000 (£23,000).
The organisation is sought out by fighters for additional testing to the work carried out by country-specific agencies such as Ukad.
The Las-Vegas based Vada has earned a glowing reputation in the sport and was responsible for tests which led to the likes of American heavyweight Jarrell Miller and Mexico's Saul 'Canelo' Alvarez facing bans for doping in recent years.
Most recently, Andy Ruiz Jr praised the thorough nature of Vada testing he faced before becoming unified world heavyweight champion in June.
Whyte's failed test with Ukad reportedly took place in late June, around a month before he was notified of findings. Ukad has so far declined to publicly comment on the test and the banned substance has not yet been officially made public.
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