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Geofence warrants, or reverse-location warrants, allow law enforcement to obtain anonymized data from Google from almost any device that was in a certain geographic area at a specific time. Police can then go back to Google for more specific user information on anyone they deem a suspect. Google said law enforcement requests for geofenced location history data in its trove went up 1,500 percent between 2017 and 2018, and at least 500 percent between 2018 and 2019. Google has yet to release any exact figures, but reportedly they have received as many as 180 requests in a single week.