Originally Posted by
notquiteaff
You’d probably have to extend it to the Schengen area because unless you rely on people being honest about their travel history, there is probably no reliable way of determining from databases whether a traveler from Austria was in Italy within the last 14 days.
Obviously, stopping all Schengen would be even more effective, but the idea isn't to be 100% effective (you really can't be), but to get as much bang for your buck. Just threaten "liars" who don't honestly report their travel history with jail. And then put somebody in jail if you catch them. That's good enough, I think.