She’s not wrong

At this point TSA is just like "fuck it, sure its a gun, but if you pinkie swear not to use it, we won't bother with the hassle of taking it" and honestly, I don't really blame them.

It’s a trick! The authorities cannot beat that logic.

The rule is that you cannot taking anything that's liquid at room temperature. Ice at 20 degrees will become liquid, and thus not allowed