LOS ANGELES (AP) — A staff member of Lance Armstrong’s Team Radioshack has arrived at a Los Angeles courthouse to appear before a federal grand jury hearing evidence of alleged doping in professional cycling.

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Exercise physiologist Allen Lim was seen reporting to the grand jury room around 9:30 a.m. Wednesday. He was greeted by an assistant U.S. attorney overseeing the probe, which has issued subpoenas and solicited testimony about whether Armstrong and other cyclists took banned substances.

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Lim also has ties to disgraced cyclist Floyd Landis, who accused him in an e-mail earlier this year of helping him cheat during his career. Lim has denied Landis’ allegations.

Grand juries meet in closed session and testimony is sealed.

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