Many of the states rushing to ban abortion are also the biggest users of a surveillance tool that authorities could use to track women ending their pregnancies — the location data from people’s phones.
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Cahn noted that geofence warrants are often just the start of an investigation: Once police get data from Google on what devices were within a specific location, they can then send a follow-up request for more details from those devices, such as Google account information, which can include email content, names and associated phone numbers.