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So they even need a warrant? I was under the impression that no US constitutional protections apply to foreigners, and when entering the country you need a visa or equivalent preauthorisation, and there you certainly agree they can do whatever they want with you.

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That sounds mostly right to me.

I think many constitutional protections do apply in case the USA is prosecuting an individual, eg even as a non American you could take the 5th if an American court was trying to convict you.

However, when you're asking to enter the country as a non US citizen your options are essentially to do whatever the border services agents ask you to do or turn around and go home.

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