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* 1. Law enforcement has used facial recognition technology to identify protestors.

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* 2. Police use a tool that lets them download text messages from all the phones within its range — which can be up to a mile.

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* 3. Our government is storing the communications of an unknown number of its citizens.

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* 4. If law enforcement agencies want your location data, they don’t need a warrant — they can just buy it.

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