That seems to be representative of the only actual ruling on this topic that I can find
>The Fifth Amendment to the U.S. Constitution gives people the right to avoid self-incrimination. That includes divulging secret passwords, Judge Steven C. Frucci ruled. But providing fingerprints and other biometric information is considered outside the protection of the Fifth Amendment, the judge said.
>The Fifth Amendment to the U.S. Constitution gives people the right to avoid self-incrimination. That includes divulging secret passwords, Judge Steven C. Frucci ruled. But providing fingerprints and other biometric information is considered outside the protection of the Fifth Amendment, the judge said.
[1] http://blogs.wsj.com/digits/2014/10/31/judge-rules-suspect-c...