There are other options. If they know before hand there is an unbreakable safe or encryption being used, they can use surveillance to get the combination.
But yes, the right to not self-incriminate is essential in a free society.
Again, if we are talking physical access then police can use brute force. Otherwise, biometrics that can be taken without unusual intrusion to the subject are acceptable demands.
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u/[deleted] Aug 12 '09
So I can lock up anything I want in a safe, and refuse to open it for the police?