Before the liquid restirction, they had a higher success rate.
I was caught with an expensive swiss army knife at TSA LAX about 3 years ago. I didn't give it up because I had extra time. I went back and bought a roll of tape in the terminal and clandestinely taped it underneath a street side phone kiosk. Went through TSA. 2 days later picked it up on my return.
Thank god no one saw me taping a knife underneath an airport phone!