32-year-old Jemima Sumgong was found to have taken banned blood-booster EPO in an out-of-competition test in her homecountry.
The banned substance, EPO, also known as erythropoietin, is a hormone that can increase endurance and, in athletics, is used mainly by long distance-runners.
Sumgong had once also tested positive for a banned substance in 2012, won the London Marathon in 2016 before claiming gold in Rio, becoming the first Kenyan woman to take the title.
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