The American Civil Liberties Union has obtained documents showing how Immigration and Customs Enforcement has gained access to a vast surveillance database of billions of records on vehicle locations and is using the data to track down undocumented immigrants. The data gathers license plate numbers from red-light and speed-limit cameras, toll booths, parking lot surveillance cameras and other sources in order to track drivers, with little or no federal oversight. Democratic Senator Ron Wyden of Oregon has called the program “a massive, for-profit location-tracking database [and] about the worst idea I have ever heard of when it comes to Americans’ privacy and security.”