Given the rulings that police can compel you to open your phone via biometrics but not via your password[0] I’d like to add a required expression or other distinction to my face as a sort of password for Face ID. Ideally this would keep the convenience of Face ID while reducing the privacy risk. I’ve tried resetting it with various facial contortions and covering parts of my face with my hand but my normal face continues to unlock the phone. Has anyone else tried this? Have you found a work around?

[0]https://www.google.com/amp/s/www.wired.com/story/police-unlock-iphone-face-id-legal-rights/amp