Unlike passwords biometrics are not easily stolen, brute forced guessed, nor impersonated. When used with a mulit-factored approach guarantees the identity of the person using it.
The best way to protect data from being viewed or stolen is by making it worthless. Data that has been ecnrypted with a strong cipher is nearly impossible to break. Providing a part of a complete data protection system.
A complete data protection system taking Identification/Authentication, Encryption and Access Control and combining these into a single easy to use package.