Now that U.S. sports authorities have successfully pursued a doping case against Lance Armstrong, some federal investigators want to know why U.S. prosecutors wouldn’t.

US Attorney Andre Birotte Jr. (L) speaks to reporters on December 14, 2010 in Los Angeles during a press conference after the “Lost Boy” international child pornography ring was dismantled.
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US Attorney Andre Birotte Jr. (L) speaks to reporters on December 14, 2010 in Los Angeles during a press conference after the “Lost Boy” international child pornography ring was dismantled.
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