thatguymike parent
If this holds, can cops still ask for whether a specific phone number was present on a cell tower at a certain time? I can't tell if it's the breadth of the data collection that's unconsitutional because it catches lots of innocent people's data; or if it's the concept of using cell towers altogether.
It's the breadth. Searches have to be narrowly tailored to provide evidence of the specific crime being investigated. There's discussion of this on pages 12–13 of the judge's opinion.