Disney Cruise Lines contract that all guests are obliged to.
'37. The Guest, in the interests of international security and safety at sea and in the interests of the convenience of others, agrees and hereby consents to a reasonable search being made of the Guest's person, property, and stateroom and to the removal and confiscation or destruction of any object which may, in the opinion of the Carrier or the Master, impair safety, inconvenience others or violate Carrier rules and regulations. '
Also, they may know that the 'drone' is powered by lipos, and lipos tend to explode according to the hype.
'33. Except in the sole discretion of the Carrier, no pets or other animals are allowed on board the Vessel. Guest may not possess firearms, explosives, flammable materials, other hazardous goods or non-prescription controlled substances. Such shall be surrendered to the Master at embarkation. In any circumstances and in the Master's sole discretion, any item deemed inappropriate may be refused on board the Vessel or confiscated, destroyed or surrendered to authorities. Guest shall have no claim for loss, damage or inconvenience thereby incurred.'
With being in international waters, they have to basically observe all laws, all time.
More from their site...
Prohibited Items
Q: What items are not permitted on board?
A:
In order to maintain a safe and secure environment for our Guests and crew, the following are examples of items that Guests are not allowed to bring on board. These and other similar items will be confiscated upon being found.
Weapons and firearms (including ammunition, knives—including dive knives—swords, daggers or any other types of weapons) are not allowed onboard under any circumstances
Realistic replicas of firearms and weapons
Highly flammable liquids and combustible substances
Non prescribed controlled substances, illegal drugs, medically prescribed and synthetic marijuana
Hookah pipes
Power Tools and Tool boxes (except those tools of the trade utilized by vendors providing services)
Sporting equipment (i.e., baseball and cricket bats, hockey and lacrosse sticks, pool cues, ski poles, fishing gear and archery equipment.)
SCUBA equipment (i.e., tanks, spears guns /slings, dive knives, pry bar, and underwater scooter)
Kites, balloons, surfboards, wave boards, inflatable floats/pools (including pool noodles), and wagons
Bicycles, Segways, skateboards, inline & roller skates, any footwear with wheels, (i.e. Heely's type shoes)
Electrical appliances such as rice cookers, hot plates, coffee makers, electric irons, bottle sterilizer and bottle warmers, electric blankets, electric blenders, etc. Please note: A limited number of approved bottle warmers and bottle sterilizers are available upon request through Guest Services. Also all ships offer laundry facilities with irons and ironing boards. Valet laundry service is also available for a nominal fee.
Candles & Incense
DVD, VCR, or Blu ray players or, Playstation, Xbox, and Nintendo Wii gaming systems are not allowed because of compatibility issues with the stateroom TVs
Musical instruments
Large Ice Coolers (Please note: small, personal-sized coolers, no larger than 12" x 12" x 12" brought onboard for the purpose of housing medications are permitted as carry-on luggage.)
Homemade, pre-cooked or other perishable food items plus any open snack containers
Metal detectors are not allowed on the ship or on Castaway Cay, as any object found using thesedevices would need to be returned to the owner or donated to charity
Personal fireworks or pyrotechnics
Seasonal and celebratory lighting strings
Liquid oxygen
Extension cords
Surge Protectors