Via Bruce Schneier, who is a well known critic of what he calls "security theatre", http://www.schneier.com/blog/archives/2012/11/on_the_ineffect_1.html
He links to this AWESOME story http://www.gizmodo.co.uk/2012/10/search-me/
Here is a snippet teaser, trust me, I didn't snip the best part, so go read whole article:
“That search was absolutely useless.” I said. “And just shows how much of all of this is security theatre. You guys are just feeling up passengers for no good effect, which means that you get all the downsides of a search – such as annoyed travellers who feel like they have had their privacy violated – without any of the benefits. I could have hidden half a dozen items on my person that you wouldn’t have had a snowball’s chance in a supernova of finding. That’s what I meant.”
That Gizmodo article was written by Matt Delito, "a police officer in London’s Metropolitan police force."
He blogs about his work and more at http://mattdelito.wordpress.com/
I immediately followed his RSS feed http://mattdelito.wordpress.com/feed/
after reading his story.
Also very true!!