I also wanted to add that why are we still relying on human error... we see things go wrong all the time. Why is it that every time I purchase a ticket I pay some additional fees, yet when I get to the airport I get these rent-a-cops? Can't all that money buy some reliable equipment to prevent this? Sorry I fly quite frequently and it is just absurd... they get away with everything, but if you protest or open your mouth they flag you for additional search, or may label you a threat... grr!!!