From The Baltimore Sun: Carroll County (Md.) school officials will discontinue use of a cafeteria checkout system with palm-scan technology after parents who complained that the system violated their children's privacy. School Superintendent Stephen Guthrie has decided to halt use of the system and to ask officials to look at other options. The technology identifies distinctive palm and vein patterns in the hand and converts that image into an encrypted algorithm, which links to a student's account. The system has been used at 10 district schools since October.