Supreme Court to decide legality of geofence search warrants: The justices will consider whether criminal investigators can use broad sweeps of cell-phone location data.

4th amendment absolutely forbids that.

They will likely allow it, but good faith readings of the constitution will not be a factor. The bill of rights got ratfucked before most of us were born and the police state is built on the fear of the others.

They already can use stingers to see all phones and texts and calls from cell towers. It impersonates a cell tower and forwards it through. As I understand it. After 9/11 they had grants and distributed them nationwide through some homeland security thing. State police, larger districts all have them.

This might just make it legal to use that info in court.

As of now they need to find a plausible legal way they found that info to use it in court, or other evidences.