■■■Customs and Border protection Officers at airports or port of entry must determine the nationality of each applicant and assess the admissibility of the traveler to ensure they can lawfully enter the United States under the requirements of the Immigration and Nationally Act. Officers make determinations based on an evaluation of the information they have at their disposal when a person seeks entry to the United States. Each applicant for admission is subject to complete inspection on each arrival in the United States. No one is allowed to enter the United States until he or she has satisfied the examining officer that he or she is either a citizen of the United States or an alien who has overcome all grounds of inadmissibility.