They find out that someone arrested in Alabama has a warrant for murder in New York City. That is the way the system is working today all over the country. We cant make this work at an international airport to ensure people who have a limitedtime visa in the United States actually leave when they are supposed to? And when we find out someone may be a terrorist or connected with some illegal enterprise or terroristic plan. we want to know if they actually left the country or are still in the country. This is something law enforcementthe FBI and Homeland Securityneeds to know about.