Another article describing what CBP can do at the border.
https://uk.news.yahoo.com/heres-us-c...014200934.html
Here's what US Customs and Border Protection agents can and can't do with your devices
The section of giving up passwords is interesting. Take the article for what it's worth.
I think the bottom line is that if a person enters the U.S. then any electronic device a person may have is subject to inspection.