Bruce Schneier has the goods on the TSA’s Secure Flight program, which is designed to check whether airline passengers are on terrorist watch lists. Unfortunately, the program was expanded to take over the functions originally designed for the CAPPS-II program, which would assign some kind of risk score to every airline passenger based on a bunch of factors mined from commercial databases. This program was killed in Congress, but the homeland security people just can’t resist the temptation to repeatedly revive it. Anyway, Schneier has all of the details.