Last time I went through ATL I was given the option of putting my 'liquids' into my 'checked' bags.
As I recall we arrived at the farthest terminal building, went through pASSport control, picked up our checked bags, handed in the white piece of paper to the [cough] nice [cough cough] gentleperson, gave back our checked bags, to be transported to the main terminal, went through 'normal' security, onto the train to the main terminal, picked up our bags, and off into the land of concealed (and not-concealed) weapons.
So, in the gap between handing of the piece of paper and giving back the checked bags I had the opportunity to put my duty free purchased dangerous liquids into my checked bag.
Perhaps they have changed this 'Rube Goldberg' system, but then again why would they?