> If you were traveling with said friend (you being the foreign national and friend being the US citizen), CBP would just make you unlock your own phone. This i

> If you were traveling with said friend (you being the foreign national and friend being the US citizen), CBP would just make you unlock your own phone. This is not like a logic game you can outwit. It's not a logic game, you're just adding hurdles to the search which make it less likely, and leaning on the legal privileges of the citizen. To do what you propose, CBP would have to flag the citizen for search and connect them to the foreign national before they pass immigration and customs. If they manage to do that, the foreign national needs to comply. If compliance is not an option for them, this idea won't work.