behavior detection deals with a lot more stuff then your smile,.. and if you knew the first thing about behavior detection, and body language you wouldn't be laughing.
if you knew the story of richard reid -the shoe bomber.. you would know why his plan failed... one of the first BDO's for the TSA noticed he was acting strange, not just his facial expressions.. he questioned him for so long he missed his flight,, but at the time shoes were not checked so he got to rebook his flight.. but the fact that he was questioned, he got so nervous he was sweating into his shoe which ruined the fuse.. he didnt set off any alarms, he didnt have any prohibited items,, but someone was able to watch his actions and he pulled him aside for 1 hour of questioning.. so out of thousands of passengers that day, reid was the one that got stopped.. that must have been an accident
behavior detection is nothing new,, ask any cop,, when you pull someone over, you only need 10 seconds of looking at the person to know weather or not they got something in their car..
but i guess its all a big joke to you idiots