The breakthrough relied on a little-known quirk of push alerts, a basic staple of modern phones: Those tokens can be used to identify users and are stored on servers run by Apple and Google, which can hand them over at law enforcement’s request.
But the investigative technique has raised alarms from privacy advocates, who worry the data could be used to surveil Americans at a time when police and prosecutors have used cellphone data to investigate women for potentially violating state abortion bans.
The data has become prized evidence for federal investigators, who have used push tokens in at least four cases across the country to arrest suspects in cases related to child sexual abuse material and a kidnapping that led to murder, according to a Washington Post review of court records. And law enforcement officials have defended the technique by saying they use court-authorized legal processes that give officers a vital tool they need to hunt down criminals.
Full story: The FBI’s new tactic: Catching suspects with push alerts
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