There's a law here in Indiana (I think it's Indiana-wide... but it may just be per-county) that prohibits the use of fireworks unless you sign an agreement to take them out of state, and even then I think it's either legal only on New Year's and July 4th, or the cops just don't enforce it during those days (which makes it just as good as being legal). I think the law's just in place to give cops some ammo to use for arrest in case someone's being a complete idiot with their fireworks, because I never see the sensible pyrotechs get in trouble around here.