You cannot be forced to reveal your passcode. But Face ID is a whole different issue.

Could you defeat Face ID simply by refusing to focus on the device? And does the law allow for you to be forced to unlock your phone using your face?

“The law is not well formed to provide the intuitive protections people think about when they’re using a Face ID unlock,” Jennings said. “People aren’t typically thinking [when they use Face ID] that it’s a physical act so I don’t have this right against self-incrimination.”

Current law, obviously, was written before Face ID was a thing. So I’d expect challenges to make their way up the appeals court ladder, possibly being decided by the Supreme Court. And I’d expect new laws to be crafted specifically to address Face ID.

Fascinating issue.