[ThatGeoGuy]

Keep in mind this is strictly relevant to US jurisdiction. In Canada, I recall that you can be compelled by a court to give up a password, or be held in contempt. That being said, something like TouchID is irrelevant if the password is going to be forced out of you anyways.

[jxcl]

This makes sense if you tell them that you know the password and refuse to give it, but what if you claim not to remember the password? Or claim never to have known it? What burden of proof is required then in order to be held in contempt?

[rdtsc]

They won't believe and lock you up until you remember?

Contempt of court can basically be "get into jail indefinitely" card.

From the wiki: "The civil sanction for contempt (which is typically incarceration in the custody of the sheriff or similar court officer) is limited in its imposition for so long as the disobedience to the court's order continues: once the party complies with the court's order, the sanction is lifted."

It seems a judge can "choose" not to believe you. Whether they truly don't or not is another problem, but officially they can claim so. I am not sure if it takes another superior judge to get someone out of jail in that case or ... or just wait for the original judge to retire...

[toomuchtodo]

I would like two passwords. One that unlocks the phone, and one that wipes the entire device immediately.

[ThatGeoGuy]

This would be useful if you had information that would put you in jail for the rest of your life, and certainly should be something offered for users who need it. However, being put in contempt of the court is not joke, and I can't imagine this would go over well if you tried it when compelled to unlock the phone.

Hidden containers similar to what TrueCrypt could do might take you farther in this regard. Self-destructing a hidden container should ideally not expose what you wish to protect and at least provide plausible deniability.