The disgraced American cyclist Floyd Landis used a hidden wire and secret camera to gather audio and video evidence for an United States investigation into doping in the sport, according to the New York Daily News.
The newspaper claims Landis used the equipment for a meeting earlier this year with Michael Ball, owner of the Rock Racing team that featured Tyler Hamilton and other former Lance Armstrong teammates.
Accusations of doping by Landis against Armstrong, a seven-time Tour de France winner, and many of his former teammates have prompted the wide-ranging investigation.
Landis was stripped of the 2006 Tour de France title for doping and after testing positive fought his punishment for years before eventually admitting that he took performance-enhancing drugs.
Armstrong has denied any wrongdoing, including claims by Landis of systemic doping.