It is easy. The agents at the border will not be doing anything. They will just look at the screen and see if there is warning/red flag next to it provided by s

It is easy. The agents at the border will not be doing anything. They will just look at the screen and see if there is warning/red flag next to it provided by some automatic system. Obviously this system will be wrong often but who cares, when you are building an authoritarian state.