Defense contractor Leonardo is marketing SignalTrace: sensors clipped onto existing license plate cameras, already on poles in all 50 states, that sweep your phone, watch, AirPods, and pet's microchip. No warrant. No opt-out. No federal law against it.
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A new kind of license-plate-reading camera will also scrape the smart devices you take with you, and wrap all that data in a nice little bow for law enforcement and the government.