Note: TSOs on the board, please donīt get ideas from this regarding limiting chocolate.
I never understood why we are limited in our amounts of liquids we can take aboard, but are allowed unlimited amounts of things such as chocolate. The argument that TSO present ("we donīt know what it is and it could be an explosive") would be pertinent to chocolate bars too.
Sorry, am I trying to apply logic to TSA rules??
Having said that, I suspect the duty free stores seal everything to avoid trouble with the very fuzzy definition of what is liquid enforced by the TSA.