A passenger waits before an airport security checkpoint. Youre nervously glancing at your watch and the snake of people in front of you, when an employee from the Transportation Security Administration (TSA) suddenly pulls you aside. Youve been selected for the PreCheck line, which means you wont have to take off your shoes, remove your computer, or sweat through the tedium that normal security lines entail. You waltz past the checkpoint and arrive at your gate with time to spare, and everything seems great — except for the fact that youve just breezed through a security procedure typically reserved for thoroughly vetted passengers.