Individuals seeking admission into the U.S. must demonstrate that they are eligible to enter the U.S. In order to be lawfully admitted into the U.S., individuals must be inspected by a CBP officer. Through the inspection process, CBP determines the admissibility of applicants for admission.
During an inspection at the border, a CBP officer will determine:
(1) Why you are coming to the U.S.;
(2) What documents are required for you to enter the U.S.;
(3) If you have the required documents;
(4) How long you should be allowed to remain in the U.S.; and
(5) If you are admissible or inadmissible.
CBP makes these determinations during processes called primary inspection and, if necessary, secondary inspection.