Cuff someone, pull their phone out of their pocket, hold it in front of their face. "Is this your phone? Oh, it looks like it is..."
How's that Fifth Amendment thing working out for you?
EDIT: There's legal precedent that specifically says you can be compelled to unlock your phone with your fingerprint, and that's not "testimonial" (that is, your right against self-incrimination isn't in play). There is zero reason to think FaceID will be treated any differently.
How's that Fifth Amendment thing working out for you?
EDIT: There's legal precedent that specifically says you can be compelled to unlock your phone with your fingerprint, and that's not "testimonial" (that is, your right against self-incrimination isn't in play). There is zero reason to think FaceID will be treated any differently.