New Hampshire Vocational Rehabilitation can only serve immigrants who can legally work in the United States.
These include those who
Information about Documentation Other Than Social Security Number
Green Card (a.k.a. Permanent Resident Card)
Any person not a citizen of the United States who is residing in the U.S. under legally recognized and lawfully recorded permanent residence as an immigrant. Also known as "Permanent Resident Alien", "Lawful Permanent Resident," "Resident Alien Permit Holder," and "Green Card Holder." (definition from uscis.gov). More info on permanent residence at www.uscis.gov/greencard
Definition (from about.com): A green card is a life-long visa ("pass") allowing a foreigner to live and work in the United States. The card itself is a government-issued plastic i.d. card that serves as proof of this permanent resident status in the United States. In size and format, it generally resembles a driver's license.
The official title of the card is "Permanent Resident Card" and as it so happens, the card is not green. The nickname may have come from the symbolic nature of the color green in the United States: Green has come to mean "go," as it does on a traffic light.
Beware: A green card is not citizenship. A green card can be revoked if a person does not maintain permanent residence in the United States, travels outside the country for too long, or breaks certain laws.
EAD (Employment Authorization Document). These may be issued to individuals with a Green Card application pending; those who are seeking asylum may have a temporary EAD.
Employment Authorization (from uscis.gov)
U.S. employers must check to make sure all employees, regardless of citizenship or national origin, are allowed to work in the United States. If you are not a citizen or a lawful permanent resident, you may need to apply for an Employment Authorization Document (EAD) to prove you may work in the United States.
USCIS issues Employment Authorization Documents (EAD) in the following categories
These individuals do not need a permanent resident card (green card), EAD or visa to work in the U.S. They have a stamp on their passports. If they are in the U.S. for 1 year they can apply for a green card. Once they have a green card, in 5 years they can apply for citizenship. Once they have citizenship they have the right to petition to bring their family member(s)' mother/father/spouse/etc into the U.S.
In terms of providing vocational rehabilitation services, there is nothing we can do for undocumented immigrants.
Some Resources for Additional Information
Some other questions addressed at uscis.gov
Pages from Handbook for Employers www.uscis.gov/files/nativedocuments/m-274.pdf (section 8)
Visas: [this section is being worked on - in the meantime, you can find information about work visas at www.uscis.gov/files/article/E1_english.pdf
Documents That Establish Both Identity and Employment Eligibility