The report really is extraordinary. For years, me and a few other journalists have investigated the US government's purchase of location data. It turns out agencies were breaking the law basically the entire time. ICE has been told to stop and has refused.
CBP, ICE, Secret Service all had a legal obligation to get approved privacy impact assessments before buying the tech. All failed. CBP had interim policies. ICE and Secret Service didn't have any.
"The report makes it clear that DHS agencies have been playing it fast and loose with their acquisition of Americans’ location data," EFF says. Says Congress needs to pass law forcing warrants (proposed law in response to my reporting is pushing for that).
https://www.404media.co/ice-cbp-secret-service-all-broke-law-with-smartphone-location-data/