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iPhones stored for forensic analysis unexpectedly reboot, causing problems for officials
(appleinsider.com)
This is a most excellent place for technology news and articles.
It protects you from being compelled to provide biometrics to unlock the device. Since the courts have made a distinction between providing a password and biometrics to unlock devices for whatever asinine reason.
Biometrics are what you have and a password is what you know. I can record you and look at you or even grab a part of your body (e.g., for fingerprints) but it's not possible to read your mind.