This is one of the major issues with laws requiring password disclosure. First of all, a truly careful criminal can use this method to comply with the law whil

This is one of the major issues with laws requiring password disclosure. First of all, a truly careful criminal can use this method to comply with the law while still hiding what they are really after -- negating the usefulness to some extent. Secondly, once law enforcement catches on to this, they can then claim that someone that does disclose a password actually gave them a plausible deniability or duress key, and they haven't actually given up the real key, and thus the innocent person could potentially be convicted for not giving up a password that doesn't even exist.