Frankie Andreu admitted in September 2006 that he had taken EPO to help prepare for the 1999 Tour de France, when he was riding for the US Postal team.
Lance Armstrong tested positive for corticoids during the 1999 Tour de France. The small amounts of corticoids in a urine sample were explained by the prescription for skin cream (saddle sores / boil / allergy) that he subsequently presented to the UCI, thus he was cleared of any offence.
Tyler Hamilton won the gold medal in the men's individual time trial at the 2004 Summer Olympics in Athens. That medal was placed in doubt on 20 September 2004, after it was revealed that he had failed a test for blood doping (receiving blood transfusions to boost performance) at the Olympics. Two days after the announcement of his positive test result at Athens, the IOC announced that Hamilton would keep his gold medal because results could not be obtained from the second, backup sample. The Athens lab had frozen the backup sample, which made it impossible to repeat the blood doping test. Hamilton also tested positive for blood doping at the 2004 Vuelta a España, where he won April 8 stage. In April 2005 he was banned for 2 years for blood doping. The UCI summary of 'Decisions on Anti-Doping Rule Violations made in 2006' stated that for Homologous Blood Transfusion he would be sanctioned to "disqualification and ineligibility for 2 years"
Roberto Heras, the winner of an unprecedented fourth Vuelta a España, tested positive for EPO prior to the penultimate stage of the 2005 Vuelta a España. He was stripped of his 2005 Vuelta win and the victory was given to Russian Denis Menchov. The UCI summary of 'Decisions on Anti-Doping Rule Violations made in 2006' stated "disqualification and ineligibility for 2 years".
Floyd Landis was fired from the Phonak team on 5 August 2006, after a test result indicated an abnormally high testosterone/epitestosterone ratio after stage 17 of the 2006 Tour de France. On 20 September 2007, he was stripped of his title as winner of the 2006 Tour and placed under a two year ban from professional racing, following an arbitration panel's 2 to 1 ruling. He appealed the result of the arbitration hearing to the Court of Arbitration for Sport, which subsequently upheld the panel's ruling. He remained suspended until 30 January 2009.
Manuel Beltrán tested positive for EPO after the first stage of the Tour de France. The news broke on 11 July 2008. Blood abnormalities before the tour start had led French anti-doping agency AFLD to target the rider. Beltrán's team Liquigas withdrew him from the tour with immediate effect. French police questioned Beltrán over possible offences, and searched his hotel room. The B-Sample has not yet been tested
On April 17, it was announced Tyler Hamilton tested positive for banned steroid Dehydroepiandrosterone (DHEA) after an out-of-competition control in early February. He faces a lifelong ban, and decided to retire with immediate effect.
Also on 22 April 2010, it was announced by the UCI that Team Radio Shack rider Li Fuyu had tested positive for the banned substance clenbuterol during the Dwars door Vlaanderen on March 23. He has been suspended by his team pending the outcome of the B sample testing
On 29 September, a UCI statement was released announcing that this year's Tour de France winner, Alberto Contador, had tested positive for "a very small concentration" of the banned stimulant clenbuterol, on July 21, one of the race's rest days. He has been provisionally suspended by the UCI