bingo, lack of even basic psychological profiling training is a greater threat that multi million dollar machines cant pick up on. why cant they spend this money to train more profilers?
and how abut israeli technology that scans the face temperature in the crowd. a person who is about to commit a crime exibits higher body temps, especially in the face area, as adrenalin is rushing the blood with all things attached.
also, sometimes, even for a normal law abiding citizen seeing a fully equiped and armed soldier can make one nervous. for a civilian its an unusual thing to be subjected to. and sometimes when u resort to mil spec security, it sends out a subconsious signal that not all is under control. ive seen armed guardsmen in NYC many times, and their location nor the perimeter control would not prevent anything from happening. they’re just standing there bunched up and presenting an single target for a would be suicide bomber.
basic principle of counter-diversionary/terrorist tactic goes that u cant prevent the event from happening at the scene, u got to strike at the conception. cause once they planned the attack, and set off to a location, there is a 95% chance that they will succeed in it, no matter how secure the location. its a change in mentality and approaches with regards to the security issues today that need to be adressed.