I know this is five years late, but I just watched the movie and came on here. Hope you're still watching.
The limit varies from state to state, but generally, in most places, if you have a blood alcohol content of .08, then you've hit your limit. Anything over that is legally drunk.
And the DWI death rate has probably raised since 1984, especially when you consider how much our society has changed. Thanks to the internet and texting, everything has to be instant, so when people get in their cars, they drive faster, because they must be there as fast as possible. People leave too late and speed to their destination, so there are more and more wrecks, and alcohol certainly is a factor.
If we all liked the same movie, there'd only be one movie!