Kenya's Lucy Kabuu Wangui, a former Commonwealth 10,000 metres champion, has been handed a two-year ban after testing positive for prohibited substance morphine.
Wangui's ban runs from August 1, 2018, with her results from April 8, 2018 to August 1, 2018 disqualified, including her victory at the Milan Marathon.
The Athletics Integrity Unit (AIU), the independent organisation that manages all threats to the integrity of the sport of athletics, announced the ban on social media.
"A Tribunal Decision has been issued against Kenyan distance runner Lucy Kabuu Wangui under articles 2.1 & 2.2 of @iaaforg rules: 2 years ineligibility from 01 Aug 18 & DSQ of results 08 April 18 - 01 Aug 18," a tweet from AIU reads.
That case's current status is "decision appealable".
Wangui, 34, has twice finished in the top 10 of the Olympic 10,000m, at Athens 2004 and Beijing 2008, and won the Commonwealth Games gold medal at Melbourne in 2006.
Her best success in recent years has come over the marathon distance, where she set a personal best of 2 hours 19min 34sec in Dubai in 2012.
This time ranks her 16th on the all-time list over 26.2 miles.
A Tribunal Decision has been issued against #Kenyan distance #runner Lucy Kabuu Wangui under articles 2.1 & 2.2 of @iaaforg rules: 2 years ineligibility from 01 Aug 18 & DSQ of results 08 April 18 - 01 Aug 18. Find out more:https://t.co/bgkh8SNc2k #AIUNews #athletics #antidoping pic.twitter.com/om4ZYDHemK— Athletics Integrity Unit (@aiu_athletics) 14 January 2019
Last month, it became apparent that a host of top Kenyan athletes could be barred from competing at major events after Athletics Kenya chairman Jackson Tuwei claimed those who have failed a drugs test or served a doping suspension will not be able to represent the country.
Tuwei fired a warning to competitors in the nation following a spate of recent high-profile positive tests from Kenyan athletes, insisting they would not allow "any convicted doper to compete for us no matter how good they are even after completing their ban".
It effectively appears another way of introducing a life ban for drugs cheats, a concept which has largely proven unenforceable in law.
Tuwei was adamant, however, that those who have tested positive will not be selected for major events including the Olympic Games and World Championships.
This could include the likes of World Championships 800m bronze medallist Kipyegon Bett, three-time Boston Marathon champion Rita Jeptoo and Rio 2016 Olympic marathon gold medallist Jemima Sumgong, all of whom are currently serving doping suspensions.
Tuwei also revealed Kenyan athletes will only be able to compete once they have undergone at least three out-of-competition tests and three tests during competition.
He claimed he did not want competitors from the nation to be ridiculed in the same way as controversial American sprinter Justin Gatlin, who has served two doping suspensions, was at the 2017 International Association of Athletics Federations (IAAF) World Championships in London.
Numerous Kenyan athletes are currently suspended for anti-doping rule violations, while the IAAF included the distance-running superpower on a list of nations most at risk of doping in July 2018.