Meanwhile, the Department of Homeland Security has acknowledged the existence of a program that assigns travelers crossing U.S. borders a computerized score rating their risk as terrorists or criminals. The risk assessments are kept on file for 40 years. Travelers are not allowed to see their own ratings. The program has affected nearly every traveler crossing U.S. borders in the last four years — including U.S. citizens. David Sobel of the Electronic Frontier Foundation said: “It’s probably the most invasive system the government has yet deployed in terms of the number of people affected.”