Mexico

Card Name: 
Multiple cards (Acta de Nacimiento, Carta de Naturalizacion o Documento migratorio)
Issuing Agency: 
Registro Nacional de la Poblacion
Voluntary or Mandatory: 
Voluntary
Card Purpose: 

Essential for tax declaration, registering with companies, schools, affiliation to any health system, passport, etc.

Additional Information: 

The multiple cards are to be unified in the Clave Única del Registro de Población (CURP), which isn't an ID card, but more like a National Insurance Number.

http://www.physorg.com/news/2011-01-mexico-iris-technology-id-cards.html

http://www.wnd.com/?pageId=263797

http://www.unisys.com/unisys/news/detail.jsp?id=1120000970001610095

http://www.youtube.com/watch?v=IR8XKDLw7WY