Pepper spray is widely used for self-defense and it's legal to carry it in all 50 states. But some places do have prohibitions on the stuff, specifying the amount of spray one can hold or the power of the blast or the age at which sprays can be obtained, and other limitations.
While pepper spray can make a handy tool for self-defense, it is used as a weapon, too, so that means it can be used against you. If you are carrying pepper spray, or plan to pick some up, be careful about how you use it so that you don't end up hurt by your own self-defense mechanism or end up accidentally committing a crime. Let's briefly consider pepper spray limitations and dangers.