I believe they said there is no waitning period in Georgia. Pass the background check and you take the gun home right then and there.
States with a "waiting period" are in the minority, and personally I think it's a stupid measure. If a guy wants to commit a crime like this, he can wait two days to do it. This kid, if I recall, had his pistol for over a week before he did this.
I hate to say it, but if you want incompetent shootings then no waiting could be a good thing. This guy didn't so much cool down as anneal.