Track and field career
In high school, Jones won the CIF California State Meet in the 100 m sprint four years in a row, representing Rio Mesa the first two years and Thousand Oaks high school the last two. In 1992, she was successfully defended by attorney Johnnie Cochran on charges of missing a routine drug test. She was selected the Gatorade Player of the Year for track and field three years in a row, once at Rio Mesa and twice at Thousand Oaks. She was the Track and Field News "High School Athlete of the Year" in 1991 and 1992. She was the third female athlete to achieve the title twice, immediately following Angela Burnham at Rio Mesa High School, who was the second to achieve the title twice.
She was invited to participate in the 1992 Olympic trials, and after her showing in the 200 meters finals, would have made the team as an alternate in the 4 × 100 meter relay, but she declined the invitation. After winning further state-wide sprint titles, she accepted a full scholarship to the University of North Carolina in basketball, where she helped the team win the NCAA championship in her freshman year. Jones redshirted her 1996 basketball season to concentrate on track but was injured and never got the opportunity to try out.
She excelled at her first major international competition, winning the 100 m sprint at the 1997 World Championships in Athens, while finishing 10th in the long jump. At the 1999 World Championships, Jones attempted to win four titles, but injured herself in the 200 m after a gold in the 100 m and a long jump bronze.
At the Sydney Olympics, Jones finished with three gold medals (100- and 200-meter sprint, and 4 × 400 m relay) and two bronze medals (long jump and 4 × 100 m relay). However, she was later stripped of these medals after admitting her use of performance-enhancing drugs. 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 4 × 100 m relay.
On her 2004 Olympics experience, Jones said "It's extremely disappointing, words can't put it into perspective." She came in fifth in the long jump and competed in the women's 4x100 m relay where the team swept past the competition in the preliminaries only to miss a baton pass and finish last in the final race. Jones promised that her latest defeat would not be the end of her Olympic efforts, and reasserted in May 2005 that winning a gold medal at the 2008 Olympics remained her "ultimate goal."
May 2006 had Jones run 11.06 at altitude, but into a headwind in her season debut and beat Veronica Campbell and Lauryn Williams in subsequent 100 m events. By July 8, 2006, Jones appeared to be in top form; she won the 100 m sprint at Gaz de France with a time of 10.93 seconds. It was her fastest time in almost four years. Three days later, Jones once more improved on her seasonal best time at the Rome IIAF Golden League (10.91 seconds), but lost to Jamaica's Sherone Simpson, who clocked 10.87.