Looking for Mexican Citizenship? Who's eligible?

[WhiskeyGirl]

The procedures which lead to Mexican naturalization demand a number of requirements for qualification.  These depend upon an assortment of factors such as your links to Mexico, whether you are of Latin American descent, whether you are married to a Mexican, your current immigration status and how long you have resided in Mexico. A good immigration lawyer can help you establish your eligibility.

Once you file the application, the procedures take up to one year to complete, and perhaps even longer.  Toward the end of the process you will get tested on your knowledge of Mexico in a “multiple choice” type examination consisting of some fifteen questions. It’s not hard, but you will need to have a basic grasp of the Spanish language to pass it.

With this certificate in hand, you may apply for your Mexican passport and, just as importantly, your IFE card (known colloquially as simply, el IFE, or tu IFE) – that is technically a voter registration document, but also serves a de facto National ID Card in Mexico. The card incorporates features such as scanned fingerprints, holograms and other security devices. It’s the size of a driving licence and so is readily portable and durable.

more here - http://www.mexperience.co.uk/blogs/mexicoinsight/?p=218

How is it possible that folks from Mexico don't have identification when they are stopped by authorities?  Example - when they cause a car accident, don't know who they are (give multiple names/ages/birth dates/addresses)? 

How many Americans have been victims of illegals or others that don't take responsibility for their car accidents?

If Mexico has a scanned fingerprint database, why not identify these folks with their fingerprints and hold them accountable?

Is there any sharing of information between the US and Mexico regarding identity?