biometrics are also way less unique then people think

basically the moment you apply them to a huge population (e.g. all of US) and ignore temporal and/or local context you will find collisions

especially when you consider partial samples weather that is due to errors of the sensors used or other reasons

Innocent people have gone to prison because of courts ignoring reality (of biometric matches always just being a likelyhood of matching not ever a guarantee match).