The Department of Homeland Security (DHS) has purchased a sinister surveillance tool that could allow ICE officers to monitor unsuspecting members of the U.S. public as they go about their day.

DHS’s Homeland Security Investigations (HSI) and Immigration and Customs Enforcement (ICE) have bought software that is updated daily with “billions of pieces of location data from hundreds of millions of mobile phones,” according to procurement records reported by 404 Media on Tuesday.

The outlet states that HSI and ICE selected PenLink’s Tangles and Webloc because the package offers “forensic and predictive analytics,” which enables analysts to correlate those movements with social media.

Demonstrations of similar tools have shown how these datasets can map visits to abortion clinics, churches

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