Olympic marathoner Shmyrko banned for doping in Ukraine http://mainichi.jp/english/english/newsselect/news/20151126p2g00m0sp016000c.html

Agent: Boston Marathon winner Rita Jeptoo failed doping test http://www.usatoday.com/story/sports/olympics/2014/10/31/rita-jeptoo-positive-doping-test-boston-marathon-winner-kenya/18240941/