First federal court decision on “geofence” warrants

Orin Kerr at Volokh Conspiracy has posted an essay on a recent federal district court decision regarding the legality of so-called “geofence” warrants, which involve law enforcement getting access to Google’s cell phone location data and using the data to advance a criminal investigation. Google apparently imposes its own sort of “warrant” requirement, and the basic questions in the case, United States v. Chatrie, involve whether the request for the data is a Fourth Amendment search at all, and whether Google’s warrant process comports with the Fourth Amendment. Kerr’s post is here.