FBI Can Use Dead Suspects' Fingerprints To Open iPhones -- It Might Be Cops' Best Bet

"“Fingerprint evidence – unlike a password – is physical evidence that can be compelled with a court order, overriding the objections of an accused or the next of kin of an accused,” said Andrea Matwyshyn, Northeastern University professor of law and a visiting research collaborator at the Center for Information Technology Policy at Princeton University.

“Additionally, fingerprint data is frequently available through other government sources such as immigration registration databases or other government databases. Forensic examiners may also be able to lift fingerprints from the body of a phone itself for purposes of unlocking a device protected with a biometric password.” Lifting fingerprints is exactly what whitehat hackers did when creating their own fake fingers to bypass TouchID."