A Lebanese-born C.I.A. officer who had previously worked as an F.B.I. agent pleaded guilty on Tuesday to charges that she illegally sought classified information from government computers about the radical Islamic group Hezbollah.

The plea agreement by the defendant, Nada Nadim Prouty, appeared to expose grave flaws in the methods used by the Central Intelligence Agency and the Federal Bureau of Investigation to conduct background checks on its investigators.

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