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
# – # – # – # – #
Personally, I’d say “hell no” and be prepared to buy a new phone.
YMMV
Clearly, it’s unconstitutional.
— 30 —