Final answer:
Traveling with a gun is subject to federal and state regulations; however, one may travel with a gun if they adhere to specific legal exceptions like having a recognized concealed carry permit and complying with transportation laws, which usually require the gun to be unloaded and locked away separately from ammunition.
Step-by-step explanation:
A person traveling from another state with a gun in their car may do so under certain legal exceptions, such as if they have a concealed carry permit recognized by the state they are entering. However, the right to travel with a firearm is not absolute and is subject to both federal and state regulations. The specific exception that allows for this type of travel could require no permit if the travel complies with both the state and federal firearm transportation laws. These typically require the firearm to be unloaded and stored in a locked container separate from the ammunition.
The Second Amendment and various Supreme Court decisions, such as District of Columbia v. Heller and McDonald v. Chicago, protect an individual's right to keep and bear arms for traditionally lawful purposes, such as self-defense within the home, and this protection extends to the states.
Nonetheless, each state has the power to regulate firearms differently, and travelers need to be aware of and comply with the laws in the states they are traveling through. Restrictions such as background checks for gun purchases, prohibitions on certain types of weapons, and carrying permits can vary considerably from state to state.