Incadrarea intrebarii e gresita - nu e o tema medicala mai degraba una legala - privind imigrarea
Exceptii de la regulile normale de imigrare sunt acordate pe diverse motive - de ex; umanitare - un cetatean afgan poate sa se refugieze in Canada cu o viza temporara dupa care poate sa solicite acordarea statutului de rezident permanent pe motive umanitare ( acasa e razboi civil si il impusca daca se intoarce) FARA sa paraseasca Canada, spre deosebire de romanul care depune cererea de rezidenta permanenta in Romania si asteapt 2-3 ani sa i se aprobe
De la aceasta exceptie se pot face alte exceptii
Ce te faci daca cetateanul are HIV si e si bolnav mintal? si vrea sa stea permanent in SUA
Trebuie sa completeze un formular complicat si sa i se aprobe sederea si-l pui sa mai plateasca o taxa dupa care ii dai voie sa ramana


http://www.nationalimmigrationreform.org/lateamnesty/I-690.p...


exclusion
Exclusion is the formal proceeding in which an alien's admissibility to the United States is determined. If an alien is determined to be inadmissible to the United States he may be excluded from entry and forced to return to his or last foreign departure point or deported to his home country (at government expense). Exclusion proceedings, hence, take place only for aliens arriving at a Port of Entry, Airport/Sea Landing Zone, or other Entry/Departure Route to or from the United States. When an alien arrives at a port of entry to the United States, he is subject to inspection. Immigration officers/inspectors question all applicants for admission (even U.S. citizens), examine documentation, and determine whether an alien may be admitted to the United States. If during such inspection, an issue arises as to whether the alien may be permitted to enter the United States based upon his claimed status (citizen, lawful permanent resident, nonimmigrant visitor, or other status) or whether an alien although having demonstrating a claimed status may not be entitled to such status (e.g., criminal conviction, abandonment of status due to excessive absences from the U.S., terrorist activity, medical contaimination, physical/mental defect, etc.), then a U.S. INS immigration officer may serve an applicant with a "Notice to applicant for Admission Detained for Hearing" (Form I-122). Exclusion proceedings may then be formally commenced with the filing of the Form I-122 with the Immigration Court for further proceedings. An alien will be scheduled for an appearance before an Immigration Judge to have his excludability determined accordingly
http://www.vkblaw.com/law/depproc.htm

- se refera la permisiunea ( sau lipsa ei ) de a intra pe teritoriul unei tari ( aici USA)