I was thinking of getting in to some of the weapons form and I wanted to learn something that I can actually carry. The problem I have found is that a lot of states(military, I move around a lot) have made laws that prevent you from carrying most weapons. A stick is often lumped in with a blackjack and is often only allowed to be carried by Police(baton). Knives seem to be the least restricted from what I have seen, but I would prefer to bind or lock someone over cutting them. Even a Kubaton is often outlawed under a fist pack in a lot of places. So are there any weapons forms that can be used most places?
First, I am not a lawyer, this is not legal advice.
Second, yes, many types of martial arts weapons are illegal in many locations. In the USA, that often depends on location. There are few restrictions on weapons other than firearms at the federal level. States and municipalities are free to ban non-firearms as they wish, and they often do.
Why? I guess the only answer to that is 'it depends'. Back in the day when ninja stars and nunchaku (aka 'numchucks') were all the rage, there were plenty of idiots running around using them on each other. Given their popularity and fear-factor pushing citizens to push law-makers to 'do something about it', many martial arts weapons were banned. Edged weapons were often banned anyway, based on things like blade length and concealed vs open carry.
I used to carry a small pocketknife with me everywhere I went - and I traveled by air for a living. Prior to 9/11, it wasn't an issue. No one ever gave me grief about my tiny pocketknife. After 9/11 it wasn't permitted. Why? Go ask Congress. I won't get involved in political discussions about it.
Now, to finally answer your question, let me first warn you that you're about to get a lot of advice from people who do not know what the hell they are talking about. Sorry, this thread is not new, lots of people ask this question in various forms, and lots of armchair cops and wannabe lawyers answer with bad information. Just sayin'.
1) Do your own research. Every place is different. You'll have to check local as well as state laws, and you might even want to ask an attorney if you want to be certain.
2) Some places exempt legitimate martial arts study, but those that do, require that you be on your way to or from your study place, not with a set of chucks rattling around behind your driver's seat at all times, get it?
3) Illegal weapons are whatever the cop says they are, basically. If you have a 'tire thumper' and you're not a professional truck driver with a need to thump tires (by the way, that's a thin and laughable excuse on its own, google it), you might find yourself in hot water.
4) Lots of people sell lots of crap that is supposed to be 'dual purpose' such as pens that are really dagger-type weapons, and keychains that are really flails. Don't fall for it. The people who sell you that crap won't stand behind you in court if a cop decides to take it from you and charge you with carrying a concealed or prohibited weapon.
If you are looking for an unlicensed, daily carry weapon, that you can train in and carry concealed 100% of the time in every location, they do not exist. Learn to fight with your fists and feet and improvised weapons, or get a CCW and learn to shoot.
There is no magic weapon that all cops will give you a pass for if they happen to find it in your pocket.