Feds Can't Force You to Unlock Your iPhone with Finger or Face, Judge Rules
If you fall asleep, can the police just hold your finger to your phone?It seems very clear to me that this is not a testimonial act. Nor is their 'coercion' here in the communicative sense. I'm guessing there are other laws that prevent police from handling your body to retrieve evidence, or at the very least, laws that require a warrant for such actions.