Earlier quoted context omitted.
I'm not sure how the courts will differentiate between biometric data related to authentication and biometric data from blood tests, breathalyzers or DNA tests. The latter are, in a sense, examples of forcing you to divulge something stored in your body.
Implied consent (the authority the police use to try to force you to divulge your blood alcohol content) is a well-established area of law. The courts can differentiate it by saying that the legislature has written implied consent laws that cover what you are deemed to have consented to when operating a motor vehicle, and that the legislature has not written implied consent laws for cell phones/etc. Right now it's a…
Indeed - warrantless blood tests have been found unconstitutional by SCOTUS three years ago (Birchfield v. North Dakota).