Quote Originally Posted by Aggie View Post
OK, I may be a little dense but, how exactly does an air puffer thingy help with security? I've not seen one of these things yet and I went through Houston just last summer which is pretty big.
It's similar in appearance to the metal detector, but as you stand in it it puffs air at you from various angles. Sensors then "read" the air to see if you're giving off chemical traces from nonmetallic explosives, etc.