You’re arrested and your phone is held up to your face to be unlocked by the arresting officer, then sent to a forensics lab. Dystopian future or one where FaceID collides with weak self-incrimination protections for biometrics? This talk will explain how your 4th and 5th Amendment rights interact with advances in biometric technology. Along the way it will offer design suggestions for creators of mobile devices and tips to end users.