ACLU and EFF Sue Over Warrantless Phone and Laptop Searches at U.S. Border
aclu.org
aclu.org
Multiple circuit courts have upheld the Government's right to do this, and that this right extends to electronic files and information. Only the Ninth has disagreed (United States v. Cotterman).
I tried to warn people before the other article got any comments, but they just downvoted me. https://news.ycombinator.com/item?id=15240973