USADA responsible for checking allegations

NEW YORK -- Olympic and track and field officials responded with caution to the latest allegations made by BALCO founder Victor Conte in interviews with ABC News for "20/20" and with ESPN The Magazine.

Conte said he gave Jones human growth hormone and other performance-enhancing drugs.

Jones' attorneys denied she ever used performance-enhancing

International Olympic Committee president Jacques Rogge said he was aware of Conte's accusations.

"I hope the truth will emerge," he said. "We want the truth.
We want to know what happened and the more we know the better."

Rogge spoke to the AP in Dubrovnik, Croatia, where he is
attending a meeting of the European Olympic Committees.

The International Association of Athletics Federations said it
would wait to see the program before commenting, but the track and
field governing body stressed it would be up to the U.S.
Anti-Doping Agency to take any action.

"We have a lot of confidence in USADA," IAAF spokesman Nick Davies said. "We have full confidence in them and they have
already successfully prosecuted a number of athletes related to

In excerpts released by the network of the interview to be
broadcast Friday night, Conte said he started supplying Jones with
performance-enhancing drugs in the weeks leading up to the 2000
Olympics, where Jones won five medals.

Conte said he gave her a substance called "the clear," which
was later determined to be THG, EPO and insulin. He also showed her how to inject hGH into her leg.

Jones, who is under investigation for steroid use by the U.S.
Anti-Doping Agency, has denied using any performance-enhancing
drugs and passed a lie detector test arranged by her attorneys in

"Mr. Conte's statements have been wildly contradictory, while Marion Jones has steadfastly maintained her position throughout: She has never, ever used performance-enhancing drugs," said her attorney, Rich Nichols. "... Mr. Conte is simply not credible. We challenge him to submit to the same lie detector procedure that
Marion Jones passed."

Jones, who failed to win a medal at this year's Olympics, has
never failed a drug test, but Conte said no accurate tests existed
for the substances he gave her during the approximately 13 months
he worked with her.

Information from The Associated Press was used in this report.