More than 150 professional footballers are likely to be playing under the influence of performance-enhancing drugs, according to a study carried out by the BBC.

Knowledge bank: This PowerPoint presentation by the chairman of WADA's Finance and Administration Committee explains in detail the preparation of the WADA Code and the changes from the first to the second draft.

Knowledge bank: Doctor and senior consultant Michael Friedberg explains the origins, properties and medical uses of EPO in the treatment of kidney patients.

Knowledge bank: The decisions in "Hamburger" and "Bray" of the Court of Arbitration for Sport (CAS) bring to the fore the question with whose laws do the athlete comply?

The Italian doping expert Sandro Donati reveals the growing consumption of sports drugs and the related illegal sector, using one Italian court case as an example of how internationalized the drug trade is

The IOC wants to use the Olympic games in Sydney to rehabilitate Olympic doping control. A timely decision and professor John Hoberman argues that the Sydney Games are one of our last opportunities to prevent the further transformation of sport into a high-performance freak show.

It has been nearly 30 years since a previously unheralded Finnish policeman named Lasse Viren burst onto the scene in Munich at the 1972 Olympics, winning two gold medals and setting a new world record for 10,000 meters.

According to some of the world's leading sports researchers, the war against sports drugs cannot be won.