To prove their U.S. immigration status , we need to see a current U.S. immigration document , such as a I-551 Lawful Permanent Resident Card , Machine Readable Immigrant Visa ; or a I-766 Employment Authorization Document , EAD , work permit
Alright, and what if I am unable to come up with some of the documents I need, like ID stuff?
If you can't come up with the usual proofs of identity then we may accept other items, like an adoption decree or a doctor, clinic or hospital record.
What if they are not American?