Alaskan, the 3 inch rule on knife blades is fairly common in most of the lower 48. I've been around some driving truck and found that, excepting some specific locations and purposes, the law overall limits a legally carried knife to a 3 inch blade or less. Generally, the denser the population the more restrictive the laws in that regard. In a rural location enforcement is less likely than in an urban location but the law remains in force. What you can do on private property is yet another thing. On a farm or ranch you can carry a claymore if you want since it's not public property, but you can't carry it in town. I've read of guys running afoul of concealed weapons laws wearing a sgian dubh in some places as well.