What did the clerk at the DMV tell Vargas when he went to apply for a driver's license at age 16? How did this impact his life?

The woman at the DMV asked for Vargas's paperwork. He presented a green card he had found in his grandparents' files for him. The DMV clerk whispered to him that it was fake and to never come there again. Vargas was confused and horrified at the possibility that he was an illegal immigrant.