This is good news for American privacy advocates, as well as anyone traveling to the US who is concerned that the Dept. of Heimat Security might decide on a whim to seize your electronic devices and search them. No probable cause, no grounds for more than a superficial examination is what the ruling seems to say:
9th Circuit Appeals Court: 4th Amendment Applies At The Border; Also: Password Protected Files Shouldn't Arouse Suspicion | Techdirt
In a somewhat surprising 9th Circuit ruling (en banc, or in front of the entire set of judges), the court ruled that the 4th Amendment does apply at the border, that agents do need to recognize there's an expectation of privacy, and cannot do a search without reason. Furthermore, they noted that merely encrypting a file with a password is not enough to trigger suspicion. This is a huge ruling in favor of privacy rights.