The most ambitious effort is in Prince William, the state’s second-largest school system. The county has spent $130,000 on the Raptor visitor ID system to protect its nearly 73,000 students.
Here is how Prince William’s system works. Starting this week, parents and visitors must request permission to enter any of the county’s 86 schools from a school official, who scans the visitor’s government-issued identification, such as a driver’s license, into a computer database, which stores the photograph and ID information. Next, the system checks the name against state sex offender registries. A school chaperone will escort any visitor tagged as a sex offender.