No. Maryland does not recognize permits from any other state.
Well, generally speaking, "CCW" isn't a charge. If you mean unlawful carrying of a handgun, one possibility is, every state has places that are off limits, even with a carry permit, for example, bars are off limits in most states. If you are caught carrying a gun in a bar, you can get into trouble, even in you have a permit. Another possibility is, many states require the gun to be concealed. If you carry a gun and it becomes exposed, you might get into trouble.
Not until you actually get the permit.
Only if he has a 'concealed carry weapons (CCW) permit'.
I understand CCW permits in Florida can be obtain by almost anyone. If a tow truck driver has a CCW he is legal....
No Stun Guns are not Illegal in Wisconsin, they are just restricted. You need a Concealed carry license or a recognized out of state equivalent license to legally carry stun guns in Wisconsin. But, you can have a stun gun in your home or business and even carry it in your vehicle if it's in a closed case without having a CCW. There is a catch though. No one is allowed to sell a Stun Gun to you without a valid CCW. So in short, you'll need a CCW in order to have one.
Generally, no, especially not for K-12.
In most U.S. states, yes, you can legally carry a gun in a hospital if you have a permit, UNLESS the hospital property has a sign posted saying weapons are not allowed. To further confuse things, having a sign posted may or may not carry any legal weight, depending on state law. If there is a sign posted, in some states, all they can ask you to do is leave, but in some states, you can be arrested.
States which don't require registration (that being most of them) don't require it for CCW/CHL holders, either. <><><><> As was just said, depends. MOST states have no provision to register ordinary firearms. A few states do. Concealed carry laws are set by each state, and can vary a great deal. My home state of Virginia has no way TO register a gun. Some states require that the handgun that you carry be listed on your permit. You need to check with YOUR state licensing authority.
No. California does not honor any "gun permits" from Nevada. I assume you are referring to the Nevada CCW (Concealed Carry of a Weapon) permit as Nevada does not have any actual "gun permits".
Yes. You can even have one without a CCW, so long as it remains in plain sight at all times.
They have to be legal in every state due to the constitution. However, some states have very tight gun laws, making it almost impossible to carry.