The purpose of the master's thesis is to present the actual state of use of doping in Slovenia in top sports and to find out, based on our own research, the positions on the use of doping that occur in individual and in team sports. The research question deals with the attitude of each group of athletes towards doping in competitive achievements. The position of both groups on the occurrence of doping at different levels of competition and on the awareness of doping are examined, as well as the differences in attitudes regarding the age of the athletes and training years. The master's thesis also presents what doping is, examines the history of doping use, analyses theoretical discussions on the use of doping in sport from a sociological point of view, presents different researches on doping in sports and examines the incidence of doping in recent years. Furthermore, doping cases in Slovenia are analyzed. Data from 1996 to June 2018 show a total of 39 reported violations of anti-doping rules in Slovenia, of which 32 cases or 82 percent of violations of athletes deal with individual sports disciplines. With empirical research, we found that the interviewed athletes mostly agree that top results can be achieved without the use of doping. Athletes engaged in individual sports, to a lesser degree, than athletes who are involved in team sport, believe that in top-notch sports it is possible to succeed without interfering with doping.