Faster, Higher, Stronger - Fairer?
Is it fair for transgender athletes to take part in women’s competitions?
Cheating in sport is becoming ever harder to judge
There are many issues to deal with in trying to ensure fairness in sport - doping, technology and now gender.
Doping - the rules
What is classed as doping, why it is wrong and what happens to those caught doing it.
What is banned
The world Anti-Doping Agency's list of banned drugs and methods.
Some examples demonstrate how complicated it can be to apply the rules about doping in sport.
It's good news that athletes have failed drugs tests
Denise Lewis is pleased that cheats are exposed and punished.
Drugs in sport - public opinion
How doping stories are affecting public confidence in sport
Cheating at sport
Pressure to win can turn children into sports cheats
Lance Armstrong's drug of choice 'doesn't work' scientists claim
When in 2012 disgraced cyclist Lance Armstrong finally confessed to the most "sophisticated, professionalised and successful" doping programme the world had ever seen, he became sport's ultimate bogeyman.