UPDATE—February 19, 2014:
According to the Washington Post, just days after the story broke, DHS shelved its plans to create or tap into a national database of license plate recognition data. According to an Immigration & Customs Enforcement spokeswoman, the solicitation "was posted without the awareness of...

Co-Authored with Peter Bibring, Senior Staff Attorney at the ACLU of Southern California
Law enforcement agencies are increasingly using sophisticated cameras, called “automated license plate readers” or ALPR, to scan and record the license plates of millions of cars across the country. These cameras, mounted...