February 6, 2014
New surveillance technology can track everyone in an area for several hours at a time
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