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Should CAS decide to disqualify British tafeta, Ujah and his teammates Zharnel Hughes, Richard Kilty and Nethaneel Mitchell-Blake will lose the medal. Canada would move to second place, bronze would be added to the new team.
The case would then be dealt with by the Athletics Integrity Unit, which would decide on further sanctions. Twenty-seven-year-old sprinters have stopped working since the Olympic Games.
A sample of samples taken in Tokyo contained the substances ostarin and S-23, which are selective androgen receptor modulators (SARMs) and aid in muscle building. They have similar effects to steroids.
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