What is this magic immigration card that cannot be falsified?

Question

Considering the average illegal Mexican spends $5,000 to come here and violate our laws, it would seem likely that a fair amount of money would be devoted to document falsification. The database seems like a good idea until you realize that one Ricardo Rodriguez could have one id card which is then duplicated creating 1,000 false Ricardo Valdez'.

Answer 1

WHAT ? AND YOUR ANSWER IS PLEASE ?