from the passcodes-ftw dept
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Best description of this I have seen is: the 5th Amendment protects compelled production what you know. It does not protect what you are (fingerprints, hair, etc).
Or “things you possess,” either. I remember being told (maybe in a college class, but I don’t remember exactly) that you can be compelled to give up the key to a lock, but not the combination to a lock.