Originally Posted by HSVTSO Dean

Speaking of changes in the SOP:

Something I meant to say last week or so when it happened. But, as no doubt most of you have read on the TSA Blog already by Bob - liquids that have been frozen into solid ice are NP through the checkpoint, though it gets a little bit more scientific* than simply saying "ice is a solid, not a liquid."

As he also mentioned, it has to be completely solid ice. Partial mixtures of ice and liquid, or a slush, are still prohibited.

( * - something about the freezing point of liquid explosives being prohibitively low, on the grade of requiring liquid nitrogen. I didn't pay too much attention to the science part of it; just sucked up the meat and potatoes and went on my way. )