It sounds odd
but, really, there's a very good reason you can't carry a knife - it's an offensive weapon as well as a defensive one. It's very difficult to claim non-premeditated reasonable force if you stab someone with a knife you'd brought out with you, because you're carrying deliberately and therefore have at least considered you might stab someone with it.
( the mighty badger Aphrodite, on a bar stool, by your side, Wed 3 Nov 2010, 13:57, Reply)