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Munguia and team maintain contamination theory despite positive B-sample

Tom Eaton

18th June, 2025

Munguia and team maintain contamination theory despite positive B-sample

JAIME MUNGUIA failed a drug test for testosterone after his recent rematch with Bruno Surace, claiming the sample was contaminated. However, his B-sample has now also tested positive.

Munguia, 45-2 (35 KOs), was dramatically knocked out by Bruno Surace, 26-1-2 (5 KOs), six months ago in one of last year’s biggest upsets, derailing plans for a second challenge at the super-middleweight world titles.

The former super-welterweight world champion was able to claim vengeance in their rematch five months later, boxing his way to a unanimous-decision on the Canelo-Scull undercard in Riyadh. His victory was soon overshadowed by a positive drug test announced earlier this month, casting doubt on his win.

Munguia and his team have denied wrongdoing, insisting the sample was contaminated, but yesterday’s B-sample test confirmed the positive result.

On Instagram, Team Munguia released a statement, where they continued to protest their innocence.

“Today, we can confirm that Jaime Munguia’s B-sample has been opened and analyzed, and consistent with the A-sample, was also positive. Jaime was present in Utah for the opening of the B-sample, demonstrating his full commitment to transparency and cooperation at every step.

“We want to reiterate that this outcome does not change our position: Jaime did not knowingly or intentionally ingest any banned substance. We remain steadfast in the belief that this result was caused by contamination, and we are continuing to take every possible step to identify the source. 

“At this stage, we are still awaiting clarification from specialists regarding the specific levels detected in the samples. As the next step, our team in submitting a list of all supplements and products Jaime used to a WADA-accredited laboratory for testing. This is critical to help determine how the substance may have entered his system and ensuring the integrity of the review.”

The British Boxing Board of Control, which sanctioned the Canelo-Scull event, will decide Munguia’s punishment, potentially a suspension, fine, or a no-contest ruling for his win over Surace.

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