From what I can tell from online searches, SD only restrictions on knives is that ballistic knives(knives that are defined as having blades that are EXPELLED from the handle by either spring or compressed air) are illegal. I am unable to find any restrictions as far as length, blade style, "concealed" carry, etc. The question is that if there are indeed no restrictions, or if there are and just are not well known. Any feedback would be appreciated.