The 9th Circuit Appeals Court has ruled that the Fourth Amendment protection against unreasonable searches does apply at the border. This might seem obvious, but it goes against existing precedent which holds that there is an exception at the border.
That decision will probably be overturned, but I’m guessing that the DHS claim to be able to perform unreasonable border searches nearly anywhere will not stand up.
The court also ruled that password-protecting a computer does not create reasonable grounds for suspicion. I certainly hope that holds up.