Kenyan marathon runner Felix Kirwa has been suspended from competition for nine months after testing positive for the banned substance strychnine.
The 2016 Singapore Marathon winner – banned until 14 November – said he had taken herbal medicines which included the stimulant.
He has been stripped of his second place at the 2018 Singapore Marathon.
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Around 50 Kenyan athletes have been sanctioned for doping violations in the past five years.
Three-time world 1500m and 2008 Olympic champion Asbel Kiprop received a four-year ban in April after failing a doping test in November 2017, while 2016 Olympic marathon champion Jemima Sumgong and former Boston and Chicago Marathon winner Rita Jeptoo have also been handed suspensions.
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