Straight from the ACLU:
Do I have to provide my laptop passwords or unlock my mobile phone for law enforcement officers at the border?
Customs officers have sometimes asked travelers to provide their laptop passwords or unlock their mobile phones when they are entering or leaving the United States. Your legal status in the country may inform what you decide to do if you’re asked for a password to unlock your device. U.S. citizens cannot be denied entry to the United States for refusing to provide passwords or unlocking devices. Refusal to do so might lead to delay, additional questioning, and/or officers seizing your device for further inspection. The same should be true for those who have previously been admitted to the U.S. as lawful permanent residents and have maintained their status — their green cards can’t be revoked without a hearing before an immigration judge. […]
The reason why you have ‘heard this idea’ is because it’s true :P
I said nothing about potentially holding your device - reread the comment you replied to - but they cannot use that as the reason to deny citizens reentry. We can have a discussion about if the administration is following the rules of law, but by law, border agents cannot deny you for this reason.
So hostile, for no reason. Channel that anger into something constructive, yeah?
Also lol if you think anyone here thinks we are in anything close to a utopia, you should switch careers to comedy :p