An anonymous reader of Dave Farber's Interesting People list has discovered a glaring flaw in the TSA's protocol for secondary screening:
today at newark airport i used a paperless electronic boarding pass on my cell phone (as i usually do). i got through the id check, stripped down to my skivvies (almost), and as i was about to walk through the magnetometer (they still have those at united newark), they were yelling out that they were checking boarding passes, take them along through the mag.
i said, it's on my phone, you really want i should take my phone through the mag?
they said "no, only take your paper boarding passes".
huh? sure enough, if you said you used a mobile boarding pass, they believed you (anddidn't even look at it (of course, only another scanner could really verify its authenticity.)
so after a bit of conversation, i found out that they were checking the paper boardingpasses to check for the dreaded four esses, meaning "secondary screening". if you are randomly selected for secondary screening at checkin, they currently won't issue you an electronic boarding pass, you have to do a manual check-in.
so now they have created a situation where someone selected for secondary screening can get through the id check with their paper boarding pass showing the SSSS, and then, when they reach the mag where the screening would occur, simply lie, saying they are using an electronic boarding pass to avoid secondary screening.