I heard this in conjunction with a recent story about legislation proposed in Michigan to ban multi-bladed locking knives. It began when a Detroit gas station was found to be selling these mall-ninja triple-bladed throwing-star looking deals to minors. Idiots began dealing with other idiots and the above proposal was the result.

One attorney was heard to argue that the lack of a locking device made it difficult/impossible to use a certain knife as an offensive weapon, and thus constituted a 'safety feature'.

Rob