Two British scientists examine the evidence of drug abuse in sports and conclude that if the trend continues, ``the outcome of sporting events will ultimately be determined by chemists with the athletes serving merely as pawns.'' In evaluating the more popularly abused substances (alcohol, amphetamines, steroids, etc.), they demonstrate how each affects the body during competition. Most revealing are the techniques used by some athletes to avoid the detection systems currently in force. A good overview of a major issue as well as a warning to the general populace of the imminent danger to the future of athletics. William H. Hoffman, Ft. Myers-Lee Cty. P.L., Fla.