Perhaps that mode could be called full disk encryption?

All humans inside the US border have the fifth amendment right to remain silent, so handing over encryption passwords to the CBP is a choice.

Unfortunately, the 5th amendment doesn't apply in New Zealand - if you remain silent at a NZ airport while customs ask for your password, they will impose a $5000 fine on you. The only viable solution I see is to only travel to places that do have 5th amendment protection or similar (which would immediately rule out Britain, Ireland, Australia, and now NZ as well).