Much effort, in the last few decades, has been made throughout much of the world to proactively prevent terrorist attacks. Much effort has been put into securing targets such as nuclear reactors, military bases, major government buildings (e.g., the Congress, White House, and various parliament buildings around the world), and airports. For the latter especially, anyone that traveled prior to the September 11th attacks is acutely aware of the heightened security that now exists at airports.