Don't have any hard opinions, but I've always gotten the feeling that fixed blades were frowned upon. I usually carry a small Kershaw clipped inside my front left pocket. It's quick to access and plenty big enough to open a brachial or carotid should the need arise.
I think it's kind of a grey area, but in your case the penalty could be quite a bit higher than just a fine. Might be better to keep a low profile until you get your piece of paper. Sometimes circumstances require that we tag each other out on defending our rights.