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In a society where women are being prosecuted for medical procedures, menstrual data becomes very risky to have handed over.
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I sat in a meeting at a data broker in 1998 where one of their product managers was strangely proud about how they could determine menstrual cycles from purchase records. It wasn't just hygiene products either. They already have that data and manipulate women with targeted ads timed for the optimal receptivity.
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Probably this yeah. Your location data can be obtained from other devices than your own, but this medical data cannot.
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From what I understand, they can get call records and subscription info w/ administrative subpoenas, but this is the first I've heard of them being able to get location data without a warrant.

Assuming you meant directly from the telcos and not from the data broker loopholes - in which case pretty much anyone should be able to do that. Emails and texts they still need a warrant for.

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Great, so they can further extrapolate what exact locations you get nervous / are more relaxed / walk more quickly… the understated problem with PII isn’t about any single data point, it’s about combining data to make probable inferences.
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The ring doesn't have gps but its app requires location permission so it gets it from your phone. It continually asks me to turn on background sync, which would presumably upload my location regularly as well. I decline and only allow location when the app is open to sync.
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Location is used for tracking distance/speed for certain activities and measuring VO2 max levels, and for finding a lost ring.
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They already know where your phone is…
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