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"Geofence warrants, or reverse-location warrants, are a fairly new concept. With permission from a judge, they 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."

"The decisions are significant because Google has reported massive growth in law enforcement use of such "geofence" searches. Google says there was a 1,500-percent increase between 2017 and 2018 and a further 600-percent jump from 2018 to 2019. That's a hundredfold increase in two years. Google received 180 geofence search requests a week during 2019, according to CNet."

""We know [geofence warrants] are a ubiquitous policing tool, and as long as companies make it possible to comply with these sorts of court orders, they're putting their users at risk," Fox Cahn said. "Whether it's Google or Uber or Lyft or payment companies, by segregating their user data in a way which prevents the aggregated location searches, you can keep that data while preventing compliance with a geofence warrant.""

"The constitutional right to safe, legal abortion has evaporated following the recent Supreme Court decision. Some states with so-called "trigger bans" have immediately criminalized abortion. Next, Congress may seek to criminalize abortion in all 50 states, putting the government in control of peoples' bodies. Google is fully complicit in the criminalization of people seeking abortion care. That's because Google stores historical location data about hundreds of millions of smartphone users, which it routinely shares with government agencies through "geofence" orders that unmask the identities of anyone who traveled to a specific place at a specific time-like an abortion clinic on a specific day. Google received 11,554 such geofence warrants in 2020."

"The use of "geofence warrants" have exploded in recent years, in large part thanks to the ubiquity of smartphones coupled with hungry data companies like Google vacuuming up and storing huge amounts of its users' location data, which becomes obtainable by law enforcement requests. Police can use geofence warrants (also known as reverse-location warrants) to demand that Google turn over information on which users' devices were in a particular geographic area at a certain point in time."