On domestic flights, passengers' names do not display as they board, and airlines don't always check passenger names against specific databases to see if there are warrants, not even when checking in online or at the airport.
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When you board a cruise ship, a manifest of passengers is sent to US Customs and Border Protection. This list is routinely checked for outstanding warrants. Any passengers with outstanding warrants are arrested upon their return. When you return from a cruise, you must go through immigration.
Travelers facing charges may not be able to travel to Mexico. Similarly, people with warrants and those on probation or parole will likely be denied entry.
All airports in the United States require security protocols that include checking their databases for passenger information and any outstanding warrants among them. For domestic flights, your name will appear in the database along with your arrest warrant, preventing you from boarding the plane.
No background checks will be performed by Carnival until a guest has booked a cruise. Carnival will provide a notice of adverse action to guests in the event it denies passage based on information in a consumer report.
Much like a hotel or plane, cruise lines in the U.S. are not required by law to do criminal background checks, or block passengers who may be registered sex offenders. Cruise ships are often called floating cities with droves of people in close quarters for a week long excursion.
TSA uses millimeter wave advanced imaging technology and walk-through metal detectors to screen passengers. Millimeter wave advanced imaging technology safely screens passengers without physical contact for metallic and non-metallic threats, including weapons and explosives, which may be concealed under clothing.
If you have an outstanding bench warrant, or an arrest warrant issued by a court, you may be detained or arrested at the airport. It is more common for your name to be checked against various databases when you are traveling internationally.
Who Investigates Crimes on Cruise Ships? Instead of police, cruise ships normally have their own security teams who act as first responders when crimes are reported on board. These internal security staff are employed by cruise ship companies and work under the authority of the ship's captain.