An anonymous reader quotes a report from the New York Times: When the Call Federal Credit Union outside Richmond, Va., was robbed at gunpoint in 2019, the suspect took $195,000 from the bank's vault and fled before the police arrived. A detective interviewed witnesses and reviewed the bank's security footage. But with no leads, the officer relied on a so-called geofence warrant to sweep up location data from all the cellphones in the vicinity of the bank for the 30 minutes before and after the robbery. The data he gathered eventually led to the identification and conviction of Okello T. Chatrie, now 31, a Jamaican immigrant who came to the United States in 2017.

Geofence searches have beco...