The Immigration Reform and Control Act of 1986 requires that Stanford verify employment eligibility of all employees, including students holding assistantships. An INS Form I-9 with appropriate documents must be presented to your department before the issuance of a stipend check. Acceptable documents for U.S. citizens include a U.S. passport, or a U.S. driver's license with a Social Security card or birth certificate. Acceptable documents for non-U.S. citizens include an unexpired foreign passport with an I-94 card or I-20 ID card showing employment authorization. Permanent residents need to provide their resident alien identification card.

source: Portfolio/I-9

See Diane's memo for new RA requirements.