As I read it, basically it says, "no deadly weapons. It defines deadly weapons as: "1. "Deadly weapon" means anything that is designed for lethal use. ". Soo... whatever that means. Now assuming you aren't doing anything else illegal, you probably will never be approached by an officer about it to have to worry in the first place, but there is always the chance something may happen where you'd have to disclose to an officer you have one. Best case scenario he realizes you aren't using it as a weapon and doesn't bother you at all, worst case scenario he says you are in possession of a deadly weapon and you get in trouble. That's you decision to make, probably won't be an issue, but there is always a chance.
That all being said, I would never carry one of these as a pocket knife for day to day tasks. First of all, the fact that they call the thing "armor piercing" bugs the crap out of me, just marketing to make stuff sound Extreeeme!
I can't imagine the butterfly knife is really designed for the strain of repetitive tasks you would put on it in the roll of pocket knife. The rivets at the pivot points will probably weaken fairly quickly leaving you with play in the knife that is frustrating and unsafe.
These are some important things I consider when buying a knife.
1. Liner - lock or lock back design are by far the most prevalent folding pocket knife designs. I prefer the liner-lock because it makes one-handed operation so much easier.
2. Clip - I don't like things loose in my pockets, I always clip my knife to my jeans pocket. I want to make sure that it has a clip, and I like if I can flip the clip to carry my knife tip up in my pocket.
3. Thumb stud or other - It has to be easy to reach and manipulate. Spyderco does the cutout on their knives, but I still find it easy to use.
4. Blade - Do you want serrations, most knife models have a serrated option or a strait edge option. I don't know too much about the steels they use, but figure most knives over $30 are at least better than something you'd pick up in a bucket at the gas station.
5. Grip - Can I comfortably hold the knife and put pressure on the knife in my hand? It doesn't have to be super-aggressive but could it work. I think about cutting strait down through something, with that butterfly knife you are putting tremendous amounts of pressure on those two rivets, and all that is held together by the small notched piece at the back of the knife. If that slips, somethings going to give.
So, IMO, butterfly knives are poor utility and/or pocket knives. I don't know if you've ever heard of a guy named "nutnfancy" on youtube, but he does a series called "BEST Folding Knives Under $40." He talks and rambles a lot, but makes some good suggestions.
http://www.youtube.com/user/nutnfancy#g/c/71D82B6E8A7BD53F. Finally, I often check the ratings on Amazon.com to see what others are saying about the knife.
Good Luck.
