
And what do those stats 78% and 80% mean?
If you have 100 people approach and ALL 100 of them have mal-intent... and then system only alerts you to 78 or 80 of them... then sure, you've got a 78-80 percent success record I guess.
It'd be much nicer if 100 people approached and only ONE of them had mal-intent and it was able to spot that person 78-80% of the time... AS LONG AS it is 100% perfect at correctly identifying the other 99 innocent people as innocent people.
78-80% success rate doesn't sound so good if it means that I have a 20-22% chance of getting a full body cavity search every time I get within 500 feet of the police.
I think there's a world market for about five computers. -- attr. Thomas J. Watson (Chairman of the Board, IBM), 1943