Greek triple jump star Paraskevi Papahristou was held back by her country's Olympic federation for tweeting racist comments.
- [Stu Forster/Getty Images]

Wang Xiaoli (R) and Yu Yang (L) play a shot during their women's double badminton match against Kim Ha Na and Jung Kyung Eun of South Korea during the London 2012 Olympic Games in London on July 31, 2012. Wang, along with other badminton players, was disqualified from the tournament for trying to lose intentionally.
- [Adek Berry/AFP/Getty Images]

Moroccan runner Amine Laalou celebrates after the 1.500 race at the IAAF Diamond League athletics Areva meeting, on July 8, 2011 at the Stade de France in Saint-Denis. Laalou was banned from competing in the 2012 summer Olympic games in London for failing to pass a doping test.
- [Franck Fife/AFP/Getty Images]

Belgian Gijs Van Hoecke competes during the Men's 15km Scratch race in the Omnium competition of the track cycling event, at the 2012 Summer Olympic Games in London, Aug. 5. Van Hoecke was banished from the Olympics on Aug. 9, after he was pictured stumbling drunkenly down a London street, propped up by two friends.
- [Eric Lalmand/AFP/Getty Images]

Russian cycling dynamo Victoria Baranova was barred from competing in the Olympics for failing a doping test prior to the games.
- [Quinn Rooney/Getty Images]

Italy's Alex Schwazer, gold medalist of the men's 50 km walk at the 2008 Beijing Olympic Games, reacts as he answers journalist's questions on August 8, 2012 in Bolzano during his press conference after he failed a doping test for using the blood-boosting agent erythropoietin EPO and being banned from Italy's 2012 London Olympics delegation.
- [Pierre Teyssot/AFP/Getty Images]