I'm thinking about the case where a person never even knew the key to what they have. The example is a business laptop being carried through customs, that was encrypted by someone else, who will decrypt it upon your arrival (or something similar)
1. If there's no evidence that you know the password, that's possibly a reasonable defense. When the police have a recording of you saying "don't worry, the files are on my encrypted partition", it's less reasonable.
2. I would seriously reconsider the decision to carry unknown contents through customs.
I'm thinking about the case where a person never even knew the key to what they have. The example is a business laptop being carried through customs, that was encrypted by someone else, who will decrypt it upon your arrival (or something similar)