We’ve maintained consistently that the most effective anti-terrorist tool in intelligence. Good intelligence can stop a potential terror suspect before he gets anywhere near the airport. Beyond that, we have screenings. The New York Times reports that the U.S. Government’s response to a warning from the man’s father that he developed radical views, had disappeared and might have traveled to Yemen, was not to revoke the young man’s visa to enter the United States, which was good until June 2010. Now, on some level, that makes sense. But their response was to flag him for an investigation should he ever apply for another visa and to add him to a list of over half a million other individuals with possible terrorist connections.