But that's all beyond the point, anyways. If they did hand you your phone and said, "enter your passphrase," you can just say, "I don't remember it." They can throw a fit and put more heat on you in various ways, but until they resort to torturing you or they develop mind-reading technology, there's not much they can do at that point until the case reaches a judge.
That's not to say "I don't remember" is a sound, blanket defense. But it's sufficient for demonstrating that these dynamics all depend on willing participants which is partially why these laws are designed the way they are.
> But it's sufficient for demonstrating that these dynamics all depend on willing participants which is partially why these laws are designed the way they are.
What happens if during serving a search warrant the door is impossible to open or they find a super reinforced safe. Owner can even say "I don't remember the combination"?