Does this apply only to U.S. Citizens? Or does it apply to everybody? And if it does, is it reason to refuse someone? I.e. can they refuse an L1B visa holder entry because he/she doesn't allow them to search the phone?
The article does not seem to cover that question. From previous discussions I have the impression that foreigners are not granted any constitutional rights at the border or even when in their home country (their communication can be freely intercepted). So the US is nowadays on my personal list of totalitarian states that I don't want to travel to. They definitely have better legislation and courts than Russia or Nor…
At border checkpoints on US soil, the border search exception to the Fourth Amendment which this court is interpreting narrowly does not differ based on citizenship. I think there is even no difference about the Fifth Amendment protection against self-incrimination in that context.
Of course, noncitizens do not have the same constitutional right to enter the US as do citizens, which is the same rule that most countries use. So refusing to cooperate at the border could block a foreigner from entering the US in ways it can’t for a citizen.
It is unfortunately also true that US constitutional rights only apply to noncitizens who are physically outside the US in very particular situations and not most of the time. (US preclearance border checkpoints on foreign soil count as physically outside the US for this purpose.) By contrast, US citizens at least in theory fully retain those protections with respect to US government actions wherever they are in the world when the US government ought to know they’re dealing with a US citizen.