Lets suppose there are going to be 10 events in the next 5 years where passengers try to take down airplanes from the interior. Also suppose there are going to

Lets suppose there are going to be 10 events in the next 5 years where passengers try to take down airplanes from the interior. Also suppose there are going to be 800 million people per year boarding planes. Any system that identifies the 10 people among the (800 million * 5) will have to have "ten nines" worth of accuracy: 99.99999999% in order for the system to have any value. These systems do not exist, and almost provibly cannot exist. We are back to square one: brute force, check each passenger for every possible threat.