There are no laws on the books with perhaps the exception of New York that tells you what you can or can't eat. Dance around it all you want but enjoy that simple fact.
Probably because you're not an American. Or maybe you are and simply insist that you're Canadian for plausible deniability however; I've never seen a Canadian so disinterested in their own politics and so completely involved in America's.I'm not sure what laws attempt to mitigate the impact of firearms in American households. I expect that it varies state by state.
With that being said....read a book...google firearm laws in the U.S. You will quickly find the laws you saw you're not sure of... They exist in every State and there have been countless....INNOCENT...individuals who have gone to prison for gun laws that were interpreted simply to find reasoning behind a tragedy like a kid shooting himself by accident.