“Technologies called MZ-catchers are very effective tool to finding out the unique identifiers on someone’s SIM card and on their mobile phone to find out who is there. So if you imagine that 20 years ago you might have needed a police officer to stop and arrest someone or to stop and search them and ask for ID to get a full list of everyone who is there, now a very affordable piece of equipment can be deployed. You can set the radius of how far you want to kind of scoop up. And then you get a list of every single mobile phone there, which can be tied back to an individual. So it is an exceptionally powerful tool at unmasking anonymous protest.”
http://rt.com/shows/sophieco/158296-spy-us-eric-king/
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