High-tech cheating (2000, Oct 2) WedMD, by M.J. Maltin [link]
A surprising and important venue for this topic, raising some comments from people who cannot be found in any of the other news articles on this topic. Inder Verma from the American Society of Gene Therapy is quoted as recognising that gene doping is possible. Verma also notes that detection is going to be difficult. The article doesn't go much further, though it is very useful information and no short cuts are made on the scientific detail.