He was instrumental in bringing down Lance Armstrong, now US anti-doping head Travis Tygart has warned Olympic chief Thomas Bach not to "throw in the towel" in sport's war on drugs.
원문출처 : https://www.cnn.com/2018/08/30/sport/travis-tygart-doping-russia-spt-intl/index.html
원문출처 : https://www.cnn.com/2018/08/30/sport/travis-tygart-doping-russia-spt-intl/index.html