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So he was “only” coerced, ie likely verbally abused and lied to (which cops are allowed to do) about the consequences of refusing to unlock, instead of being physically forced. Such freedom.
What’s that got to do with using a thumb to unlock the phone?
Sure, but what does your original comment have to do with the thumbprint?
The cops can coerce or force you to use biometrics to unlock your phone, but they can’t coerce you into giving up your passcode without a warrant.