come to think about it there were so many bags kicking around close to the belts at T4 the other I could have picked up many without anyone batting an eye.
So in fact, in Latin America (perhaps other places too), tags are checked against passes when leaving the pick-up area. At first I was surprised to see that, now I realize it decreases the chances for a casual thief to be succesful.
We (EU, USA) have a fixation with liquids and spend billions to make sure one buys drinks and food only from the shops that 'surprise' are part of the system. They are trying to prevent an easy and vile method to steal from others.
Guess which approach do I like better.