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Beijing 2008 Olympic 1500 metres champion Asbel Kiprop has tested positive for banned blood booster erythropoietin (EPO) during out-of-competition testing.
Kiprop, won the world 1500m championships three times and he is the third fastest man in history.
The 28-year-old attained prominence as a teenager when placed second in the Olympic 1500m final at Beijing 2008 behind Bahrain's Rashid Ramzi.
He was upgraded to gold after Ramzi tested positive for drugs.
Kiprop was successive at the World Championships in Daegu 2011, Moscow 2013 and Beijing 2015.
EPO is the same substance which many top Kenyan runners have tested positive for in recent years.
The Anti-Doping Agency of Kenya were also last month involved in the arrest of a chemist in Eldoret on suspicion of dealing performance enhancing drugs.
