An internal DHS document shows CBP used location data sourced from the online ad industry to track phone locations; ICE has bought access to similar tools (Joseph Cox/404 Media)

Joseph Cox / 404 Media: An internal DHS document shows CBP used location data sourced from the online ad industry to track phone locations; ICE has bought access to similar tools   —  An internal DHS document obtained by 404 Media shows for the first time CBP used location data sourced from the online advertising industry to track phone locations.