http://sls.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/technologies/real-time-location-tracking
With access to location data from commercial data brokers, federal agencies can query data about the movements of millions or billions of identifiable people at once. They are not limited to data about a single area or slice of time. They can start from a single time and place, then look forwards or backwards at the location histories of hundreds of devices at once, learning where their owners live, work, and travel.