Development is well behind schedule for a new national system to screen airplane passengers, known as "CAPPS II." The acronym stands for "Computer Assisted Passenger Pre-Screening." Homeland security officials say it's a critical tool to prevent a repeat of 9-11. But airlines are reluctant to even help test it, citing concern about passenger privacy. Some experts see an emerging battle between security and civil liberties that can only be settled in the courts. Minnesota Public Radio's Jeff Horwich has the second in our two-part look at the stalled attempt to get CAPPS II off the ground.