Add Yahoo as a preferred source to see more of our stories on Google. A key piece of evidence in many criminal cases is cell phone tracking data, which allows law enforcement to determine who was near ...

The justices were concerned that the Trump administration is asking for too much in a major police surveillance case.

Nevada quietly signed an agreement earlier this year with a company that collects location data from cellphones, allowing police to track a device virtually in real time — all without a warrant.