A person applying to become a Lawful Permanent Resident (Green Card applicant) may be found inadmissible under various grounds under Section 212(a) of the Immigration & Nationality Act (INA).

Individuals who are inadmissible are not permitted by law to enter or remain in the United States. The Immigration and Nationality Act sets forth grounds for inadmissibility. The general categories of inadmissibility include health, criminal activity, national security, public charge, lack of labor certification (if required), fraud and misrepresentation, prior removals, unlawful presence in the United States, and several miscellaneous categories. For certain grounds of inadmissibility, it may be possible for a person to obtain a waiver of that inadmissibility by filing Form I-601, Application for Waiver of Grounds of Inadmissibility. In some cases, exceptions are written into the law and no waiver is required to overcome the inadmissibility because the inadmissibility does not apply if the individual meets the exception. Examples include exceptions for aliens who have been battered, abused or subjected to extreme cruelty, who are victims of severe forms of trafficking, and who are minors.