What is the specific process of immigration inspection in the United States?

In order to avoid traffic problems or delays, China tourists accompanying the group to the United States must bring their passports, air tickets and personal travel supplies, and gather at the exit location designated by the travel agency on time to make all preparations for leaving the country. (2) Fill in the customs application form on the plane to America. On the plane on the way to the United States, flight attendants will distribute I-94 forms (that is, arrival/departure records) and American customs declaration forms to passengers. Inbound passengers can fill in these two forms in advance to speed up customs clearance. (3) After arriving at the airport, the immigration officer going to the inspected area will check the documents and valid visas held by the immigrants, scan their fingerprints and take photos for comparison, so as to ensure that the immigrants are indeed the people who have obtained visas to the United States from their domestic American embassies and consulates. (4) It may be necessary to go to the second inspection area. If immigration officers are suspicious of immigrants or randomly selected, the boarding pass will be stamped with the word SSSS, and immigrants need to wait for inspection in the second inspection area. Immigrants need to take off their shoes and belts. If there are metal objects in their coats, they may be asked to take them off for inspection. American searchers should be polite and conduct searches in a professional and respectful manner. Otherwise, immigrants can report to the customs and seek help, or seek help from the Chinese embassy in the United States. (5) After being allowed to enter the country, the immigration officer will stamp the I-94 form of the immigrant, indicating the date of entry, visa status and length of stay in the United States, and collect the first half of the form. (6) Pass the customs inspection, leave the airport and collect the checked baggage on the corresponding baggage conveyor belt. Customs officials will collect customs declaration forms, and may check whether the immigrants' luggage is contraband and taxed. After the last stop of customs and border inspection, you can leave the airport or transfer.