Each citizen needs a way to be identified. The fastest, and easiest way (for the citizen) to handle this is by a double-authentication system using a smart card and some biometric identifier.
The smart card will be all-purpose. All credit cards, bank accounts, police records, etc will be stored on it. Also, the card will be a visual identifier
A copy of all biometric stats, will be kept in a central repository in the case of loss or theft of a citizen's smart card. If the biometric is as central as a DNA test, no corroborating verification will be necessary.