SOCHI, Feb. 22 (Xinhua) -- Following is a backgrounder on doping cases at the Winter Olympic Games since the anti-doping testing was introduced in 1968:
Sochi 2014
Two-time Olympic cross-country skiing champion Evi Sachenbacher-Stehle of Germany tested positive for the banned stimulant methylhexanamine. Italian bobsleder William Frullani was caught for the stimulant dymethylpentylamine.
Vancouver 2010
Cross-country skier Kornelia Marek of Poland tested for EPO. Thirty other athletes were caught positive in the tests ahead of the Olympics.
Turin 2006
Russian biathlete Olga Pyleva tested for cardephone. Wolfgang Rottmann, Wolfgang Perner, Martin Tauber, Juergen Pinter, Johannes Eder and Roland Diethart were kicked out of the games after blood doping instruments were found in the Austrian cross-country ski and biathlon teams.
Salt Lake City 2002
Cross-country skiers Johann Muehlegg of Spain, Larisa Lazutina and Olga Danilova, both of Russia, all tested for the blood doping substance NESP. British alpine skier Alain Baxter tested for methamphetamine and a Belarussian ice hockey player was caught for nandrolone.
Austrian cross-country skiers Marc Mayer and Achim Walcher were disqualified after the games when blood doping instruments were found found in their rooms.
Nagano 1998
Snowboarder Ross Rebagliati of Canada tested for marijuana but kept his snowboard gold because marijuana was not fully forbidden.
Calgary 1988
Polish ice hockey player Jaroslav Morawiecki tested for testosterone.
Sarajevo 1984
Mongolian cross-country skier Batsuch Purewjal tested for methadone.
Innsbruck 1976
Soviet cross-country skier Galina Kulakova tested for ephedrine, Czechoslovakia ice hockey player Frantisek Pospisil for codeine.
Sapporo 1972
German ice hockey player Alois Schloder tested for ephedrine.