the liquor laws differ for each state. perhaps that's a Georgia state law (?) But, having said that, i've entered through ATL lots of times and have never come across any alcohol being taken away; not saying it never happens - but i've never experienced it or seen or heard of it happening from anyone I know; it seems like a rare occurrence.

the only thing people usually have to be concerned about when bringing back bottles, is the TSA 3-ounce restriction; because once inside the US you can't carry liquor onto the connecting flight, even if it was purchased/packaged at Duty Free.

For those with direct flights it doesn't matter, but for connecting flights, liquor bottles carried on from Mobay must be packed into the checked luggage, after clearing C & I, and before re-checking it onto the connecting flight.