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NEW: The Trump administration has bought access to a commercial database that maps the movements of millions of cellphones in America and is using it for immigration and border enforcement, sources tell @ByronTau and @MHackman wsj.com/articles/feder…
The location data is drawn from ordinary phone apps, including those for games, weather and e-commerce, for which users share location.

DHS has used the data to detect undocumented immigrants and others who may be entering the U.S. unlawfully. wsj.com/articles/feder…
As one example, this data trove was used to detect cellphones moving through what was later discovered to be a tunnel created by drug smugglers between the U.S. and Mexico that terminated in a closed KFC near San Luis, Arizona. wsj.com/articles/feder…
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