"When a cellphone passes within Wi-Fi range, sensors atop traffic signals detect it and in a flash send its digital fingerprint to the little dish — an antenna." This data can be sold to law enforcement and federal agencies, exposing personal information.https://www.seattletimes.com/seattle-news/times-watchdog/seattles-surveillance-contractor-has-history-of-illegal-sales-bribery-worrying-privacy-advocates/ …
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