The team for Junior dos Santos quickly went to work on proving his innocence Friday night.
Dos Santos was flagged for a violation of the USADA anti-doping policy, forcing his removal from UFC 215 and a bout with Francis Ngannou.
In a statement provided to MMAjunkie, a representative for dos Santos, Ana Claudia Guedes, said a diuretic is to blame:
Junior tested positive for a substance called Hydrochlorothiazide, which is a diuretic and is banned by USADA due to its use as a masking agent. We do not know where this substance came from. Junior has had his blood and urine randomnly tested many times and has never once tested positive for a banned substance.
We requested testing of his B sample today. Most times, the B sample will show the identical results as the A sample. Therefore, we are already working on analyzing his nutritional supplements and medications to determine whether anything might have been contaminated. Jeff Novitzky and Donna Marcolini of the UFC have provided the guidance for this process, and we are grateful to them for their professionalism and competence.
Junior remains committed to and supportive of USADA drug testing – even if he is bearing an unfortunate consequence of it. He spoke personally with Francis Ngannou and apologized for the unintended consequence to him. Junior thanks Francis for the sympathy, understanding, and respect that transpired during their call, and very much looks forward to resolving this situation so that he and Francis can set up a new date to face one another.