TSA Internal Test Showed 67 of 70 Failed to Find Explosives, Weapons
In our post-9/11 world, these airport checks have become the norm. But a recent report showed that the majority - the vast majority - of tests were successful in bringing hazardous items like weapons and explosives onto planes despite going through security.
Removing shoes, going through potentially harmful X-rays, throwing out a perfectly good bottle of water - apparently these things are not only annoying, they're ineffective.
A lot of these points were brought up in a recent Washington Post column by Petula Dvorak - I'd recommend it.