Recent court filings reveal that Google, by means of its Location History function that many Google users (often unknowingly) opt into, has tracked and recorded extensive location data for over 500 million people. Few of us are aware our location histories are being tracked and recorded in this way. Law enforcement agencies — state and federal — however, are keenly aware of it, and are making increasing use of this information to support criminal prosecutions by what are often called “geofence warrants.” Governmental use of geofence warrants has increased exponentially in the last several years — from about 20 a week in 2018 to over 250 a week in 2020, and rising steeply.

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