https://www.theverge.com/2017/9/12/16298156/apple-iphone-x-face-id-security-privacy-police-unlock

Today, Apple introduced a new flagship phone — the iPhone X — with a powerful new login system. Because phone’s all-glass front leaves no room for a home button, Apple is ditching Touch ID in favor of a facial recognition system powered by a new camera array and a specially modified A11 chip. Alongside the new technology, the new Face ID system raises serious questions about surveillance and user privacy. Until the phone goes on sale in November, some of those questions will be left unanswered — but this is what we know so far, and what it means for anyone thinking of buying an iPhone X.

Like Touch ID before it, Face ID raises real questions about compelled unlocking. If you’re detained by police or kidnapped by criminals, they won’t be able to guess your password — but they would be able to hold the phone up to your face until you pass a Face ID scan. It’s a major privacy concern, and one many users don’t think about until it’s too late. There’s no indication Face ID is any worse on this front than Touch ID, but it still raises real questions over how the system holds up under duress.