Cruise lines have what is called "Level 3" security measures, as outlined by the U.S. Coast Guard's "Security for Passenger Vessels and Passenger Terminals" regulations. These measures include:
• Screening of all passenger baggage, carry-on luggage, ship stores and cargo; intensified screening of passenger lists and passenger identification; close coordination with the U.S. Immigration and Naturalization Service and other federal agencies to ensure that any passengers or crew suspected of being on the INS "Prevent Departure" list are promptly reported to the federal authorities.
• Restricting access to any sensitive vessel areas, such as the bridge and the engine room.
• Implementing onboard security measures to deter unauthorized entry and illegal activity.
• Requiring all commercial vessels to give 96 hours notice before entering U.S. ports. Previously, ships had to give 24 hours notice.
• Maintaining a 100-yard security zone around cruise ships.