The 800 metres athletics world championships bronze medallist Kipyegon Bett faces a four-year ban after the Kenyan runner tested positive for the blood-booster EPO, having already been suspended and charged with evading a doping check.
The failed test was announced by the Athletics Integrity Unit, which handles doping cases for the IAAF.
The 20-year-old Bett, world junior champion in 2016, was suspended two weeks ago for "refusing or failing to submit" to a doping test. He now faces a ban 12 months after he won bronze at the London worlds.
Bett is the fourth Kenyan to face doping charges since the start of the year, and another high-profile athlete from the East African distance-running powerhouse to test positive for EPO.
Kenya's track and field reputation has been seriously damaged by the upsurge in doping cases in recent years, which has been accompanied by multiple incidents of corruption in the anti-doping system.
In one of the latest cases, Asbel Kiprop, the 2008 Olympic champion and three-time world champion over 1500 metres, is facing a disciplinary tribunal after being charged with using EPO.
His case revealed a doping officer tipped him off beforehand about the supposedly secret drug test and received money from Kiprop.
Other Kenyans facing doping charges include former 10,000-metre Commonwealth champion Lucy Wangui (morphine) and 2017 Athens Marathon winner Samuel Kalalei (EPO).
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