Professional sports are a high-stakes business and none higher than horse racing—which is why the temptation to use drugs often leads to the effort to avoid detection. Inherent in the increasingly sensitive and accurate testing for drugs is the danger that the scientific proof—the existence of drugs—will be correct but the logical deduction drawn therefrom will be incorrect, unjust, and harmful. This program explains why nitrogen is the critical element in testing for drugs; looks at the range of techniques used to test blood and urine for drugs; explains the workings of thin-layer chromatography, gas chromatography, and mass spectroscopy; and explains how certain drugs like vasodilators mimic the shape of natural molecules. (30 minutes)