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AUSTIN (AP) – The federal government says it wants Lance Armstrong’s medical records from his 1996 cancer treatments because they could prove how far he was willing to go to conceal his performance-enhancing drug use from the public and his sponsors.

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Armstrong is vigorously fighting release of his records from the Indiana University School of Medicine as part of a federal lawsuit to recover more than $30 million in sponsorship the U.S. Postal Service paid to him and his teams.

Penalties could reach as high as $100 million.

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Court documents filed last week show the government is still pursuing one of the key allegations that dogged Armstrong for years: whether he told doctors he used a host of performance-enhancing drugs and later sought to bury any evidence of the conversation through lawsuits, threats and charitable donations.

The government says those efforts hid Armstrong’s doping from the U.S. Postal Service.

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