Geofence warrants, take GPS information from G\*\*gle to find people in a location, at a time. https://www.nprillinois.org/2026-04-26/the-supreme-court-case-that-could-redefine-your-digital-privacy
"Geofence warrants," sometimes known as reverse location searches, are increasingly controversial for sweeping up information on any device that happened to be in the vicinity of a crime.