By Sam James Over the last several years, some very gifted endurance athletes have gone from famous to infamous after drug tests indicated they took banned substances, and illegal sports supplements, to enhance their performance. These men and women have been stripped of their Olympic gold medals and other prestigious accomplishments, been the subject of countless headlines and have sullied their reputations forever. By seeking an unfair advantage, these endurance athletes have gained the dreaded asterisk next to their names in publications and destroyed any possibility of lucrative endorsement deals for the rest of their lives