an aerial camera setup from Persistent Surveillance Systems that acts almost like a time machine for police, letting them watch criminals—and everyone else.
http://m.washingtonpost.com/business/technology/new-surveillance-technology-can-track-everyone-in-an-area-for-several-hours-at-a-time/2014/02/05/82f1556e-876f-11e3-a5bd-844629433ba3_print.html
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