I should add: Bonus points for making your passphrase "On advice of counsel, I respectfully assert my fifth amendment right to remain silent and decline to answ

I should add: Bonus points for making your passphrase "On advice of counsel, I respectfully assert my fifth amendment right to remain silent and decline to answer." And that "dot" on the end is important :-) Also, trap biometrics: Use a fingerprint or two as a duress code. Have an retina scanner, but only some of the participants should use it. Use that sensor for some folks, another one for others. "Sure, you can have my fingerprints! Hmmm... it was working last week, why does it say '30 day lockout' now?"