1) full disk encryption
2) police takes your laptop
3) after six months you are asked to decrypt the harddrive
4) you dont remember 100 character password after all that time
5) you go to jail until you remember
http://www.nytimes.com/2016/05/06/technology/former-officer-...
1. This is still murky law, still being explored... but I believe you can't be compelled to reveal something you know (your password) but could be compelled to reveal something you have (a key.)
2. Contempt of court I think is for 6 months at a time and has to be renewed, and regularly isn't renewed. If your hard drive contains crimes worse than 6mo of jail, contempt is a good way to go.