As the American Civil Liberties Union (ACLU) found out in 2015 through the Freedom of Information Act, the US Drug Enforcement Administration (DEA) has for years been building a massive national license plate reader (LPR) database that it shares with federal and local authorities, with no clarity on whether courts are overseeing its use. That blasé approach to mass surveillance of drivers is holding steady, as evidenced by recent revelations about California using an LPR database to track down welfare cheats.

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