In fact, US Customs and Border Protection has long considered US borders and airports a kind of loophole in the Constitution’s Fourth Amendment protections, one that allows them wide latitude to detain travelers and search their devices. For years, they’ve used that opportunity to hold border-crossers on the slightest suspicion, and demand access to their computers and phones with little formal cause or oversight.
Source: How to Get Past Customs Without Giving Up Your Digital Privacy | WIRED
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