Disgraced cyclist Lance Armstrong, who has reportedly confessed to Oprah Winfrey that he used performance-enhancing substances, apparently provided evidence to federal authorities as early as last summer, according to newly unsealed court filings.
Armstrong had been fighting a subpoena issued in 2011 by the United States Postal Service's Inspector General, who was investigating potential fraud by Armstrong and members of his team in connection with the Postal Service's multi-million dollar sponsorship. The Inspector General went to court in October of that year to enforce the subpoena after Armstrong's attorneys said he planned to ignore it. But by this fall, both sides dropped their fight over the subpoena according to a filing by Armstrong on November 5.
"The United States and Mr. Armstrong agree that Mr. Armstrong now has satisfied his obligations under the subpoena," the filing says.
The subpoena, issued in June 2011, demands Armstrong turn over all evidence involving use of prohibited substances, including Armstrong's medical records and test results. Among the requests:
- "Produce all of your medical records that reflect your use of any prohibited substances or methods."
- "Produce any records that reflect the purchase of any prohibited substances."
- "Produce all documents related to any analysis of your blood that determined your hematocrit level."
- "Produce all documents related to the use of banned substances or methods by members of the USPS team, and any documents related to allegations that members of the USPS team used prohibited substances or methods."
The subpoena also calls for Armstrong to turn over evidence involving communication and payments to Italian physician Michele Ferrari, who, like Armstrong, has received a lifetime ban by the United States Anti-Doping Agency. Ferari has denied allegations that he was involved in doping or saw any evidence of doping by Armstrong.
(Read More: Lance Armstrong's Livestrong in Jeopardy?)
The Inspector General withdrew his petition to enforce the subpoena on September 10 after Armstrong apparently complied.
"(I)t appears that court involvement in this matter no longer is necessary," the Inspector General said.
Armstrong's attorneys had sought to keep the subpoena fight under seal, but last month, U.S. Magistrate Judge Deborah Robinson ordered the case unsealed.
It is unclear just what evidence Armstrong provided or how he "satisfied his obligations under the subpoena." A spokesperson for the Inspector General's office declined to comment.
—By CNBC's Scott Cohn; Follow him on Twitter: @ScottCohnCNBC