1. A citizen carries a multitude of ID cards, which can be for various purposes and issued by multiple agencies.
    
2. For example a single adult bonafide citizen may have a social security card, national ID card, a passport, a voter card, a driving license, etc.
   

1. A single ID card needs to be issued. No need to issue multiple documents and cards to the same person.
    
2. A secret serial number (encrypted) on the card which connects it to the right database entry. No way to duplicate or forge this.A single fake document can no longer be used to generate other perfectly legal documents.
   

 
A user typically has only a single card with an embedded RFID chip with a unique number. This RFID tag number then points to an online database which is accessed by a multitude of agencies. The same database can have all information related to the holder, including details like date of birth, whether allowed to drive (electronic driving permit),

The biggest RFID card project implementation is going to be in China, where the plastic ID cards issued to Chinese citizens will be replaced by RFID cards. This may be one of the world’s biggest RFID projects, since the Chinese population toady stands at I billion and every man, woman and child will have to be issued one individual card.

In future, most national governments may employ such a card to distinguish between real & fake citizens, monitor compliance to laws and even track movements.This may be a too big temptation for any non democratic government to resist.This in turn will lead to a stiff fight between privacy advocates & political opponents on one side and security personnel & the ruling establishment on the other side.