Geofence requests also require two warrants. The first warrant retrieves a list of locatuons for pseudonymous phones in a bounded area during a bounded time. Th

Geofence requests also require two warrants. The first warrant retrieves a list of locatuons for pseudonymous phones in a bounded area during a bounded time. The second request reveals the identity of select phones. Each time you need to convince a judge to grant the warrant. Acording to this article, it looks like the suspect has an opportunity to contest the second request. This isn't covert mass surveillance. We already allow law enforcement to search more private spaces with a warrant, so this doesn't seem like a stretch.