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Watch a Privacy International activist and a Vice News journalist hunt stingray cell site simulators outside the Ecuadorian embassy (where Julian Assange is hiding out) and at a London protest. 

The activist and journalists also visit a surveillance trade fair, where they speak with a surveillance contractor offering a disturbing new technology. The tool combines video and cellphone tracking to enable police to pair images of people with the signals their cellphones transmit on the street. The contractor brags that the video, cell site simulator, and phone signal jammer can be hidden in what looks like a regular utility box.