The national sex-offender database is being put to another use in some of the US's public schools. The Washington Post describes a new computerized security system being put in place in the Prince William County School District, Virginia's second-largest. The system, called "The Raptor" "scans government-issued identification cards and checks them against a database of listings of 460,000 sex offenders from across the country." Designed by a Texas company, it's now in some 4,000 US schools, the Post reports. "In many cases, the security programs can also store parental custody information and tabulate parent volunteer hours." Some parents think it's a lot faster than waiting in line to sign in. But some immigrant-rights organizations worry about possible privacy violation, though school officials say IDs will only be checked against sex-offender registries. "Signs are being placed at schools' front desks to advise visitors that they can show an ID other than a U.S.-issued driver's license, such as foreign driver's license, a passport, a green card or a reentry permit."