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1998 Tour de France
Festina medical team member ***** Voet is arrested at the French border before the start of the Tour after customs officers seized banned substances, including the blood-boosting drug erythropoietin (EPO).
Festina are kicked out of the race and their riders later admit to taking performance-enhancing drugs. Top rider Richard Virenque is banned for nine months, team director Bruno Roussel and Voet are fined and given suspended jail sentences.
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1999 Giro d'Italia
Tour and Giro champion Marco Pantani of Italy is expelled while leading race after failing a blood haematocrit test.
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2001 Giro d'Italia
France's Pascal Herve is retired from the Giro by his Alexia team after failing a test for EPO. Mercatone Uno rider Riccardo Forconi does not start 17th stage after failing a dope test.
Police officers search the rooms of riders from all 20 teams confiscating medicines. Organisers cancel the 18th stage when riders call a meeting to discuss the raids.
Second-placed Dario Frigo is sacked by Fassa Bortolo after illegal drugs are found in his room. Frigo later admits to carrying them as security in case he needed a boost during the final stages of the race.
An insulin syringe found in a room where Pantani stayed leads to a six-month ban for the Italian.
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2002 Giro d'Italia
Italian Nicola Chesini is arrested by police after the fifth stage as part of a probe into the sale of performance-enhancing drugs.
Race favourite and 2000 winner Stefano Garzelli tests positive for the banned diuretic and masking agent probenecid and is expelled from the race. He is given a nine-month ban.
Gilberto Simoni, the 2001 champion, tests positive for cocaine. He is withdrawn from the Giro but is later cleared by the Italian Cycling Federation.
Italian Roberto Sgambelluri and Russian Faat Zakirov become first professional cyclists to be caught using NESP -- an improved form of EPO -- and quit the Giro.
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2002 Tour de France
The wife of Lithuanian rider Raimondas Rumsas, is arrested after French police find doping substances in the boot of her car. Edita Rumsas said the stock was for her sick mother.
Rumsas, who finished third in the Tour, denies his wife obtained doping products for him and that he ever took any.
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2003 Giro d'Italia
Rumsas is suspended by his Lampre team in June after failing a drugs test during the race in which he finished sixth overall.
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2006 Tour de France
American Floyd Landis becomes the first Tour winner to fail a drugs test after testing positive for the male sex hormone testosterone during the race.
Landis, who denies using performance-enhancing drugs, is due to appear before the U.S. Anti-Doping agency on May 14.
Germany's 1997 Tour winner Jan Ullrich, Giro d'Italia champion Ivan Basso are among nine competitors withdrawn on the eve of the prologue after being implicated in a Spanish doping investigation, Operation Puerto.
Ullrich is subsequently sacked by his T-Mobile team and retires from competition in February.
DNA tests confirm that some of the bags of blood seized in Operation Puerto belongs to Ullrich, the Bonn state prosecutor's office says in April.
Having dropped their investigation into Basso last October, the Italian Olympic Committee reopen it and he appears before a doping hearing on May 2. Five days later, Basso admits his involvement in the scandal.