12/17/2013 11:20 am ET

How DC Police Use Citizens As Spies

In Washington, TrapWire processes so-called suspicious activity reports filed by members of the community and adds them to its massive national counterterrorism database, attempting to identify threat patterns. However, some observers say much of the behavior can be explained as ordinary members of the public — or tourists with cameras — simply going about their business in a busy major city.

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