The above poster suggests even worse.
"until you are actually in the United States, you have no reasonable expectation of the Bill of Rights.". They suggest you have no constitutional rights outside of the US border. Forget your cell phone, this would imply that black bag operations are completely legal as long as the US citizen is outside of US borders at the time.
Admittedly, that argument is not very convincing for the US in particular so pretend we are talking about some other country that is not the self-appointed world police.
Case in point: having sex with a child outside the US is still a crime you can be prosecuted for under US law when you return.
Except for laws which expressly include territorial limits (the phrase, “within the special maritime and territorial jurisdiction of the United States” occurs as a limitation in several US criminal laws, for example) US laws absolutely do apply outisde of US borders.
"Sure officer, i'll unlock my phone and my laptop. There's absolutely nothing on it."