>If the system was configured to accept a fingerprint when logging on, it would also be possible to tamper with the firmware to that it would accept any input,

>If the system was configured to accept a fingerprint when logging on, it would also be possible to tamper with the firmware to that it would accept any input, including non-human ones such as vegetables; a video posted by Cisco shows a spring onion being used to unlock a vulnerable laptop. So you have to tamper with the firmware and THEN you get to use the vegetable.