While the program has run into controversy in some places, it also has been credited with the return of 16 children. The Alexandria-based national center for missing children plans to use the Washington program as its nationwide model.
About 4,500 children are kidnapped by people other than family members each year in the United States, a number dwarfed by the 354,000 abducted by relatives and the 450,000 who run away, according to the U.S. Justice Department.
In the grim business of finding those taken by strangers, getting the word out fast can make the difference. Police say their chances of finding a child alive are best within the first few hours of an abduction.
Broadcasters came up with the idea of using the Emergency Alert System, which airs bulletins warning communities about severe weather and other potential emergencies.
Along the way, it has attracted some criticism. In Texas, for example, organizers tightened the criteria to get on the air after radio listeners complained of too many alerts related to child custody disputes.