Homeland Security reportedly bought phone location data to track people at the border

Illustration by Alex Castro / The Verge The Department of Homeland Security has been purchasing cellphone location data and using it to track activity near the US-Mexico border, according to The Wall Street Journal. The data has reportedly led to arrests after law enforcement saw where people were crossing the border and traced the data back to specific people.
The location data comes from a commercial database composed of information compiled on users by marketing companies. Advertisers and ap