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The results and the improvement of the analytical procedures adopted for the control of doping in horses will be reported. This control has been systematically carried out in Italy for about 10 years in the laboratories of Italian Federation of Sport and Medicine in which the biological samples for the control of doping in various sport activities (football, cycling, athletics etc.) are also examined. In this way it is possible to use the same instruments for all these similar problems and compare the results. The analytical procedure is based on the following steps: 1) Extraction of the samples (mainly urine but sometimes blood or saliva). 2) Screening tests by thin-layer chromatography. 3) Confirmatory tests by gas chromatography on different columns and also by gas chromatography coupled with mass spectrometry. These single steps will be separately discussed, and practical problems encountered will be presented.