https://www.theregister.co.uk/2019/10/17/any_finger_will_do_samsung_galaxy_s10_or_note_10_plus_screen_protector_reportedly_easy_to_fool/ > Samsung is investigating a critical issue with its Galaxy S10 and Note 10 smartphones after reports that it fails to discriminate between different fingerprints if a screen protector is fitted. > The Galaxy S10 features what Samsung calls "a revolutionary new biometric authentication feature... an in-display fingerprint sensor fused into the Infinity-O Display, providing invisible yet vault-like security that keeps your data safe... it sends ultrasonic pulses to detect the 3D ridges and valleys of your unique fingerprint."