The South African was training to qualify for the 2020 Tokyo Olympics when he tested positive for GW501516 last year. The substance failed medical trials and led WADA to alert athletes in 2013 that it was a threat to their health.
Schoeman denied doping and blamed contamination of the supplements he was taking.
His ban expired in May but he faces a longer sanction from CAS if he cannot prove the source of the contamination. A possible two-year ban, until May 2021, could still leave time to make South Africa’s team for the postponed Tokyo Olympics.
In a ruling in a similar case on Monday, Australian swimmer Shayna Jack was banned for two years for unintentional doping. An Australian sports tribunal previously recommended a four-year ban.
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