Originally Posted by chollie

But does that exclude solid milk? Even TSA allows solids, although if they want to play nasty, they can just delay you at the checkpoint until they see a drop of condensation to justify confiscation. They did allow Britney's ice chips.

After the Britney fiasco, someone posted on this forum that s/he decided to test TSA's new, unposted rule about frozen liquids being allowed. S/he froze a full-size bottle of shampoo and took it through the checkpoint with no problem - because it was a solid.