While in the news currently, geofence warrants (also referred to as ‘geo-fence warrants’) are nothing new (and our article includes a real example of a geofence warrant). We first wrote about geofence warrants and how Google is providing law enforcement agencies with lists of devices it has identified as being in the area of a crime scene at the time of the crime almost exactly 3 years ago to the day. Once serving the geofence warrant, and receiving the data from Google’s massive device location database called Sensorvault, law enforcement agencies can then create lists of possible suspects and witnesses, all based on their knowing that the person was simply in the area, based on the tracking of their device.