How did Feds know that Marion Jones lied in the Balco incident?
The owner of Balco, Conte had the schedule and information on her drug use. Her ex-husband also gave information to the Feds on Marion and her coach Graham. Conte ratted out everyone he sold to, so he did not get hard time. If she had told the truth she would have lost the medals, but would not face any jail time. She never failed a drug test, nor did the others that Conte sold to. The only way the drug people found out about Balco is that someone sent them a syringe with the drugs in it and told them about it.
