The Challenge for the F.B.I.: 10,000 Terror Investigations

The New York Times: WASHINGTON — Every day, in F.B.I. offices around the country, agents leaf through classified counterterrorism documents on American citizens one last time. They reread informant reports and review surveillance logs. And then they close the case and walk away.

It is a weighty decision, one that supervisors closely review. But with up to 10,000 F.B.I. terrorism investigations open at any given time, there is little time for hand-wringing.

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