In changes to the immigration laws in 1996, called The Illegal Immigration Reform and Immigrant Responsibility Act of 1996 (IIRIRA),  a new concept was introduced in immigration law called “unlawful presence.” The concept came into force on April 1, 1997, when the reforms came into effect – or so we thought. We thought unlawful presence before April 1, 1997, would not have immigration consequences. For the immigration agencies to figure out what it meant – Congress did not define it…