Biometric Authentication isn’t the bee’s knees or its irises or its sound.
Biometrics is deprecated as a means of Authentication in NIST Digital Identity Guidelines, not only because of some amusing cases:
BBC fools HSBC voice recognition security system;
Lyrebird claims it can recreate any voice using just one minute of sample audio;
Researcher shows malware can make headphones into microphones and record voice:
but because it fails the rule of high assurance systems- “must always be able to recover from compromises” (despite the great advances in organ transplant surgery).