@KS I liked the headline today that Apple said, "Squeeze the sides of the phone if someone is forcing you to use your face to unlock."

Which will help so much if you're handcuffed and the phone fished out of your pocket. (As they mention it using IR I'm guessing a photo shouldn't work, but that's a pure guess)

http://www.zdnet.com/article/apple-just-squeeze-the-iphone-x-if-youre-forced-into-a-face-id-unlock/