https://techcrunch.com/2017/10/17/apple-responds-to-senator-frankens-face-id-privacy-concerns/

Apple has now responded to a letter from Senator Franken last month in which he asked the company to provide more information about the incoming Face ID authentication technology which is baked into its top-of-the-range iPhone X, due to go on sale early next month.

As we’ve previously reported, Face ID raises a range of security and privacy concerns because it encourages smartphone consumers to use a facial biometric for authenticating their identity — and specifically a sophisticated full three dimensional model of their face.