I once got to meet David Allen, the guy who invented the Photon light. His son was there also, has he was in the knife business, selling OTF knives. One of his demos involved putting a dollar in front of the blade opening. He would move the lever, and the dollar bill would stop the blade. This was to show how safe the knife was.

The blade also locked up nicely once fully extended. But if anything (including paper money) was in the way, the blade would not fully deploy. So the moral of the story is to alway keep your knife in the same pocket with your money. <img src="/images/graemlins/grin.gif" alt="" />

This is, however, the limit to my experience with auto knives. Up until a couple of years ago, they were illegal in my state.