Well its true

technically they can detain her for a few hours until an investigation is conducted, in the mean time the ice will melt, and therefore it is a liquid

It isn't and this is for two reasons. One is that it's a solid, blunt object, possibly could be used as a weapon, and the second is that when it melts it's more than 3.4 ounces.

Awww. I feel like I just got told Santa isn't real