Replying to an earlier post

To be fair, a duress pin is definitely a good thing to have if you’re being mugged, but using it to deliberately destroy data when it’s been seized by a lawful authority is guaranteed to land you in serious trouble pretty much anywhere. Whether the border agents were, in fact, a lawful authority, and whether they had a lawful reason to seize his phone are very different questions.

The much more sensible approach is to either have a separate phobe for travelling, that has nothing you care about on it, or wipe your phone before you travel, and spend a little time building up an innocuous history on it, without putting anything you care about on it. Anything you absolutely must have access to while you’re away can be stored, encrypted, online, and you can remember the details to retrieve it.

Replying to an earlier post

US border patrol are considered a lawful authority as they are granted their powers by the federal government and are federal law enforcement officers. They are charged with enforcing US laws, including immigration laws, at the border and in any US state or territory.

From their point of view, they are well within their rights to seize and search his phone, and he interfered with their duties by destroying the data on the phone. Whether that should be the case is a different matter.