 Jones vehemently denied using performance-enhancing drugs until her confession in 2007.A dominant force in women's sprinting, Jones was upset in the 100 m sprint at the 2001 World Championships, as Ukrainian Zhanna Pintusevich-Block beat her for her first loss in the event in six years; Pintusevich-Block was one of the names revealed by Victor Conte during the BALCO scandals.Jones, however, did claim the gold in both the 200 m and 4x100 m relay.