CBP believes it has the right to files saved locally on your device itself. However explicitly cloud-hosted data (that is not stored on the device) is supposed to be off-limits, as I understand it.
And keep in mind that American citizens cannot be denied entry to the country for refusing to unlock or hand over their devices. They might hold you for a little while, but they cannot stop you.
And keep in mind that American citizens cannot be denied entry to the country for refusing to unlock or hand over their devices. They might hold you for a little while, but they cannot stop you.