The difference is the ability to duplicate that information. For normal face to face recognition, it is reliable because it is impossible to totally duplicate

The difference is the ability to duplicate that information. For normal face to face recognition, it is reliable because it is impossible to totally duplicate another person even if you are given complete knowledge of every identifiable feature of that person. Electronic biometric identification, on the other hand, can be flawlessly duplicated provided that you have accurate information on the aspect of the person being used to id them, as well as the method of transmitting the data.