Kenyan world 800m bronze medallist Kipyegon Bett has been handed a four-year ban for doping, the IAAF Athletics Integrity Unit (AIU) confirmed on Friday.
Bett, 20, refused to allow a urine sample to be taken in February and then in July, when a sample was taken, he tested positive for the prohibited substance Erythropoeitin (EPO), an endurance-boosting hormone, the integrity unit said.