The IMEI catcher's signal isn't going to stop dead on the edge of the prison/jail yard and a lot are near/in cities. Where I live the jail is right next to the

The IMEI catcher's signal isn't going to stop dead on the edge of the prison/jail yard and a lot are near/in cities. Where I live the jail is right next to the performing arts center and the baseball stadium there'd be massive amounts of false positives.