The book addresses a series of key aspects of contemporary anti-doping policy. At the broader philosophical level, questions are asked about whether the scale of anti-doping activity and the intrusiveness of anti-doping policy in the lives of athletes is proportionate to the problem of doping. Aspects of existing anti-doping practice are also explored at the level of transnational organisations such as the EU and WADA and also at the level of the personal choices that need to be made by athletes and doctors in relation to doping control. Other contributions examine the complex issue of assessing the extent of doping and also understanding the factors that motivate athletes to use performance-enhancing drugs. The analyses provided by academic contributors are complemented by three contributions, from the World Anti-Doping Agency, UK Anti-Doping and the International Tennis Federation, which provide insights into the strategies designed to reduce the prevalence of doping in sport and the management of anti-doping processes.This book was published as a special issue of the International Journal of Sport Policy and Politics.