An unfortunate truth for cycling fans everywhere is that doping has had no small part to play in the history of the sport.
The use of performance enhancing substances were widely accepted in the early era of gruelling races like the Tour de France. A number of incidents however, including the death of Danish rider Knud Enemark Jensen at the 1960 Olympic Games team time trial, who was using amphetamines at the time, saw rules gradually introduced to combat doping.
Still, even to the present day, positive tests are not uncommon.
Lance Armstrong, who had won seven consecutive Tour de France titles until he was found guilty of using PEDs in a 2012 report, is potentially the most notorious drug cheat in cycling, if not sporting history.
But while cycling's uneasy relationship with doping continues, scientific gains have been made amongst the agencies trying to catch those who cheat, with the introduction of the Athlete Biological Passport (ABP) at the beginning of the 2008 race season by the UCI.
The World Anti-Doping Agency (WADA) is the ruling authority on anti-doping for more than 600 sports organisations around the world, including cycling's international body, the UCI.
Latest
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American cyclist Jackson ’Huntley’ Nash handed lifetime ban after doping violations
USADA hand down penalty after multiple offences discovered by investigation
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UCI suspends continental team's licence due to doping investigation
W52-FC Porto cannot compete in any races after an investigation conducted by the Anti-Doping Authority of Portugal
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Guillaume Martin: The big question is this grey area of ketones
The Frenchman says he is in favour of banning ketones for reasons of fairness
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Trial begins into French doctor and two others accused of attempting to dope cyclists
Bernand Sainz has been involved in cycling circles for the best part of six decades
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Julian Alaphilippe doesn't share Arnaud Démare's concerns over performance products used in the peloton
The Frenchman also says he 'won't be shouting from the rooftops' when he eventually decides to compete for the Tour de France yellow jersey
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Johan Bruyneel: 'Lance Armstrong was the perfect target to be sacrificed' to clean up cycling
The former rider and team boss says in his era the choice was 'either you adapt and you dope yourself, or you disappear'
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British Paralympic hopeful cyclist banned for three years for doping offence
Erin McBride, who joined the British Cycling team after switching from athletics this year, tested positive for a banned substance
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Two Italian cyclists banned following doping violations
One was an amateur time trial champion
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US amateur rider handed four-year doping ban after winning cat three race
The 49-year-old was tested after his win in the Arizona State Championships this summer
