There are no police officers on cruise ships. Large vessels staff private security teams employed by the cruise line, and the ship’s captain carries legal authority to detain passengers, but actual law enforcement power sits with government agencies ashore. Which government depends on where the ship is sailing, where it’s registered, and who’s involved in the incident.
Who Actually Handles Security on Board
Every large cruise ship carries a dedicated security team, usually six to fifteen members depending on the vessel’s size and itinerary. These officers work for the cruise line, not for any government. They break up fights, investigate thefts, preserve crime scenes, and detain passengers who pose a danger to others.
Ship security officers are certified under the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW). The International Maritime Organization requires them to assess threats and carry out the vessel’s security plan.1International Maritime Organization. SOLAS XI-2 and the ISPS Code Many come from military or law enforcement backgrounds, though that’s a hiring preference, not a legal requirement. The Cruise Vessel Security and Safety Act separately requires that at least one crew member on any ship departing from or arriving in the United States receive specialized training in crime prevention and evidence gathering.2United States Coast Guard. Cruise Vessel Security and Safety Act
What ship security cannot do is file charges, prosecute anyone, or compel testimony. Their authority ends at the gangway. They are first responders who stabilize the situation and preserve evidence until a government agency with real law enforcement power takes over at port.
The Captain Can Detain You
The captain holds broader legal power than the security team. Under longstanding maritime law, the master of a vessel can order a passenger confined if the captain reasonably believes detention is necessary for the safety of the ship, the people on board, or the preservation of order. No warrant is needed and no formal charge is required. Larger ships maintain a secure holding area, sometimes called a brig, for this purpose. Detention is temporary and is meant to last only until the passenger can be handed to port authorities ashore.
Whose Laws Apply at Sea
Jurisdiction on a cruise ship is a layered question. The answer depends on where the ship is registered, where it physically sits at the moment of the incident, and the nationality of the people involved.
The Flag State
Every cruise ship is registered in a specific country and flies that nation’s flag. Under international law, the ship takes the nationality of its flag state, and that state’s laws generally govern while the vessel is in international waters.3National Oceanic and Atmospheric Administration. Jurisdiction Over Vessels – Section: Flag State Jurisdiction The most common registrations for major lines are the Bahamas, Bermuda, Panama, the Netherlands, and the United Kingdom. Cruise lines register abroad for cost reasons; U.S. law requires American-flagged ships to be built domestically and to pay crew at U.S. wage standards.
Flag state jurisdiction is considered exclusive on the high seas unless an exception is created by treaty or international law.3National Oceanic and Atmospheric Administration. Jurisdiction Over Vessels – Section: Flag State Jurisdiction For ships carrying American passengers, several exceptions apply.
Territorial Waters and Ports
A coastal nation’s territorial sea extends up to 12 nautical miles from its coastline under the United Nations Convention on the Law of the Sea.4United Nations. UNCLOS Part II Territorial Sea and Contiguous Zone Once a cruise ship enters those waters, the coastal country can exercise jurisdiction over crimes on board. When the ship is docked, that authority is even clearer. Local police can board the vessel, investigate, and arrest, especially for incidents that happened while the ship was within their waters or in their harbor.
When U.S. Agencies Step In
For passengers on voyages that touch American ports, U.S. federal law reaches farther than most people expect. Two agencies carry the weight: the FBI and the Coast Guard.
FBI Jurisdiction
Federal criminal law applies under the “special maritime and territorial jurisdiction of the United States,” defined in 18 U.S.C. § 7. That jurisdiction covers any U.S.-registered vessel in admiralty waters, and it extends to any foreign-flagged vessel during a voyage with a scheduled departure from or arrival in the United States when the offense involves a U.S. national as either victim or perpetrator.5Office of the Law Revision Counsel. 18 USC 7 – Special Maritime and Territorial Jurisdiction of the United States The FBI has confirmed that federal agents can investigate crimes against Americans aboard cruise ships even when the ship flies a foreign flag and the incident occurred in international waters.6Federal Bureau of Investigation. Crimes Against Americans on Cruise Ships
A crime on a Bahamas-flagged ship in the middle of the Caribbean technically falls under Bahamian law as the flag state. But if an American is involved and the voyage touches a U.S. port, the FBI also has authority to investigate, and in practice the FBI typically takes the lead on serious crimes against American passengers.
Coast Guard Authority
The Coast Guard’s law enforcement powers are broad. Under 14 U.S.C. § 522, Coast Guard officers can board any vessel subject to U.S. jurisdiction on the high seas or in U.S. waters, examine documents, conduct searches, and make arrests when they find evidence of a federal violation.7GovInfo. 14 USC 522 – Law Enforcement The Coast Guard also inspects cruise ships for safety and security compliance through its Cruise Ship National Center of Expertise.8United States Coast Guard. Cruise Ship National Center of Expertise
Crimes the Cruise Line Must Report to the FBI
The Cruise Vessel Security and Safety Act of 2010, codified at 46 U.S.C. § 3507, requires cruise lines whose ships embark or disembark passengers in the United States to call the nearest FBI field office or legal attaché as soon as possible after certain serious incidents.9Office of the Law Revision Counsel. 46 US Code 3507 – Passenger Vessel Security and Safety The reportable incidents are:
- Homicide or suspicious death
- A missing U.S. national
- Kidnapping
- Assault with serious bodily injury
- Sexual assault (offenses under 18 U.S.C. §§ 2241–2244)
- Firing on or tampering with the vessel
- Theft of money or property exceeding $10,000
Cruise lines must also keep a log recording all theft complaints involving property worth more than $1,000 and make it available to the FBI, Coast Guard, and other law enforcement officers on request.9Office of the Law Revision Counsel. 46 US Code 3507 – Passenger Vessel Security and Safety Lesser incidents fall outside the mandatory reporting rule, which is one reason to file your own report if something happens to you.
What To Do If You’re a Victim
Report to ship security immediately. They are trained to secure the scene and begin preserving evidence, and speed matters. The longer you wait, the more evidence gets cleaned, overwritten on surveillance footage, or contaminated by other passengers. Ask for a written incident report and keep a copy.
You don’t have to rely on the cruise line’s internal process alone. The FBI takes reports directly from passengers, and you can contact the nearest field office yourself.10Federal Bureau of Investigation. Ensuring Safety at Sea For voyages that touch U.S. ports, the cruise line is required to report serious incidents, but filing your own report closes any gap if the ship’s internal process is slow or incomplete.
If the ship is docked in a foreign port when something happens, you can also report to local police, who have clear authority while the vessel is in their waters. At the next U.S. port, Customs and Border Protection and the Coast Guard are available as well. Photograph injuries, save messages related to the incident, and write down witness names while details are fresh. Preserving your own evidence, separately from the cruise line’s investigation, is one of the most useful things you can do.