[Ripsaw]

I think a better idea would be have it change the password/wipe data in the event that you do not log in within X amount of time (Think Lost). Keep your mouth shut for X time and there is nothing you can do to help them.

Speaking out my ass (IANAL) this is a deadman meant to protect against any attacker not necessarily law enforcement, this might be enough to keep you away from destruction of evidence charges.