?I recently read that in parts of the USA, if you use biometrics on your devices, then the police can legally use your biometrics to access your data without a search warrant. ?But they can’t force you to give your device passcodes.

Correct.

Fingerprinting suspects was ruled as NOT unconstitutional decades ago, and as a consequence utilizing a fingerprint, or, by extension, other biometrics, is permissible.

But the 1st Amendment speech rights include the right NOT to say, or write, any particular thing – including your password(s).

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