Just returned from Mexico via Cancun and entered the US in Dallas. When you buy ANY liquid at duty free, they deliver it to you when you are boarding the plane as a carry on.
When we arrived in Dallas, we had to reclaim our luggage, and any duty free liquids over 3.0 oz had to be packed in our checked luggage or they would be confiscated.
I didn't buy any liquor, but if I had I would have been screwed because there was no extra room in my checked luggage for anything.
I wonder, what happens to all of that liquor, perfume, food, etc...??