I live in one of those deep south States. And I wouldn't say it's completely dry, but you didn't used to be able to buy alcohol on Sunday. But I think where I live they changed it a few years ago so that you can't buy it until after noon, or something like that. It must be a Bible belt sort of thing. Ironic, though, because Sunday when all the Bible-thumpers are out is when you NEED alcohol the most.
Shit, it's been a while since it affected me, I don't have many occasions where I need alcohol on a Sunday now that I'm a boring adult with family and kids.
But yeah, it's stupid to limit the sale of alcohol for a brief period of time during the week, but not require extensive training/background checks, etc for weapons designed for the very purpose of killing.