Have you ever wondered why you have to show your boarding pass to purchase something in the duty-free shops, after passing security, when in fact nobody can be there without a boarding pass? The answer is starting to surface.
It turns out the government is tracking the destination of travelers who buy anything in the airport. With such a database, they could take the next step and send that info to your destination to ensure you pay the tax upon landing.
The German magazine GMX has asked the seemingly stupid question: why do duty-free airport shops require travelers to show a boarding pass once they get through security? The hunt for money just keeps getting worse.