i used to have a corkscrew in my backpack all the time because i was too lazy to actually put it away. it went from LA to home and then to toronto several times.
This Monday I was about 10 people back in line at LAX to get through the metal dectectors and x-ray machines... when they stopped everything. The woman who swabbed bags checking for explosives came up with a positive test. Army guys with M-16s and MP5s came running. The guy had a kind of mini dynamite called "seal bombs" in his back pack.
I thought security was kind of on the ball to catch him.