The Illegal Immigration Reform and Immigrant Responsibility Act of 1996 stipulates that immigrants who depart the United States after being unlawfully present in the United States for certain periods can be barred from admission to lawful permanent resident status, even if they have obtained Advance Parole. Those immigrants who have been unlawfully present in the United States for more than 180 days, but less than one year are inadmissible for three years; those who have been unlawfully present for a year or more are inadmissible for 10 years. Immigrants, who are unlawfully present, depart the U.S. and subsequently re-enter under a grant of parole, may nevertheless be ineligible to adjust their status.
USCIS urges all immigrants with pending applications for adjustment of status to consult its National Customer Service Center at 1-800-375-5283, uscis.gov, an immigration attorney, or an immigration assistance organization accredited by the Board of Immigration Appeals before making any travel plans.