Biometric identification via voice is mostly hokum. My education is in biometrics and our undergraduate seminar group had a student and his supervisor with ess

Biometric identification via voice is mostly hokum. My education is in biometrics and our undergraduate seminar group had a student and his supervisor with essentially identical voices. But that's just anecdata - the human voice doesn't carry a lot of unique information and on top of that it changes over time. In biometric identification the iris is king. 3D face scans are a distant second, fingerprints on the border of usefulness and the rest like gait, voice, keystrokes etc. get rediscovered every decade or so just to, again, not yield results.