Drug abuse in sport has now become an acute international problem, which undermines the integrity of sport and is a real danger to the health of thousands of athletes. The second edition of this publication has been updated to take account of new forms of drug abuse in the sports world, as well as developments in genetic engineering and gene therapy. It also contains a list of useful internet sources. A key finding is that the control of doping, including the harmonisation of both practice and policy among the major world sports bodies, requires a re-evaluation of the direction of future anti-doping policy, particularly in the light of the recent establishment of the World Anti-Doping Agency.