Except Mexican illegals can show their photo-copied get-out-of-jail free card from their closest illegal alien security immigration department law office. (Er, MALDEF, La Raza, or NAACP. Or CAIR, HAMAS, or ISIS/ISIL.)
Can you think of a better reason NOT to have the feds involved in concealed carry reciprocity. How many states would qualify. The less the federal government is involved in the better. What could be wrong with drivers licenses from New York or Wisconsin or Minnesota?