Depends on location for knives really, but either way they dont really announce they have a 3inch or below non-lockable folding knife on them. How common is the loosing of the blade and where does it usually happen? Would like to read some news stories on that one. the point for the cane is they know its a weapon after you have beaten off the Ruffian in question and as far as the police are concerned its a just a heavy cane. Wouldnt raise a eyebrow unless the person held it and liked weapons themselves. (apart from it not being a fashion item by many people anymore in the U.K and you look kind fo stupid with outdated fashion sometimes) To not sound obvious but to make the point i do know using a weapon opens up the lethal force factor and using a knife should be used as such and has no real alternative past intimidation to scare someone off. A stick could be used for joint locking someone if you know how so its less lethal than a knife. Feel like i need to make the point. Its not the best weapon but the point would be you have it out and ready to go prior to getting assaulted by Ruffians. The only time i have seen a weapon as acceptable to use is at your dwelling or in the case of the person having one. Its much better practice if you have a fixed bladed one though. Kind of why those ones you need a reason to carry as opposed to Swiss army knives or Spyderco grasshoppers.