The Police in Michigan is evaluating the possibility to reproduce a dead mans fingerprint from a prerecorded scan with 3D printing and use it to unlock any mobile device. Modern biometric sensors rely on electrical currents that most 3D-printed objects are not able to conduct. The University of Michigan professor coated the 3D printed fingers in a thin layer of metallic particles to overwhelm the limitation related to the electric conduction of that most printed objects. He is confident that in a few weeks he will be able to unlock the mobile device of the dead man.”]
Source: https://securityaffairs.co/wordpress/49599/hacking/3d-printing-fingers.html