Whether or not these tactics are lawful or Constitutional is a matter that has yet to be fully settled in the courts. This leaves a lot of gray area for travelers to worry about when it comes to privacy.
Source: What to do when US law enforcement asks for your password
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Personally, I’d say “hell no” and be prepared to buy a new phone.
YMMV
Clearly, it’s unconstitutional.
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Reinke Faces Life 