China is very special case of totalitarianism with low entropy, but most other totalitarianism cases have low entropy only in capital City, and extremely corrupted outside capital, especially on borders.

This is don't mean that you could run across border on station wagon filled with prohibited content, but somebody could hide something like microSD in clothes.

Exists paradox - people usually thinking, jails have very strong and serious security system so inside there should be sterile environment without anything prohibited, but in reality usually there exist black market of prohibited things.