WASHINGTON (AP) - A key House chairman says one of the Secret Service agents accused of wrongdoing in the Colombia prostitution scandal failed a lie detector test.

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Homeland Security Committee chairman Peter King said Friday that his investigators discovered that, contrary to the Secret Service's account, one agent failed a polygraph test. King, a New York Republican, also asked why Secret Service agents have not been able to find Dania Londono Suarez, the prostitute at the center of the scandal, even though she apparently granted an interview on Friday.

King's investigators met with Secret Service officials for three hours on Friday.

The incident last month implicated a dozen service members who were in Cartagena ahead of President Barack Obama's arrival there. Two of those have been cleared of serious wrongdoing.