Do not use "Biometric Authentication" if you believe that other people may have identical or very similar biometric credential(s) to your own, or your biometric credential(s) can be easily compromised. For instance, do not use Face ID for authentication purpose if you have identical twin or triplet sibling.

Do not use "Biometric Authentication" if your biometric credential(s) will be undergoing rapid development or change. For instance, do not use Face ID for authentication purpose if you are an adolescent with facial features undergoing rapid development.