Funny enough Thanksgiving 2010 I accidentally left a similar sized pocket knife in my pocket. I elected for the full body scanner which did not pickup the knife. Instead I was reminded I had it when the regular old metal detector at the cruise line picked it up. On another trip while i was still in the service I accidentally flew with chained live rounds (machine gun ammo) in my back pack. Again no security picked it up. I am a fairly small sample size but thanks to these incidents I am thoroughly convinced that the TSA is utterly worthless. On the plus side they banned the carry on of lighters for our chartered flight to Kuwait. This was the same flight that we all hand carried our weapons on, go figure.