Medicinal marijuana gummies are banned – but you can bring along your metal detector “for Port Use Only”.

You can also take your roller blades with you, but don’t try to sneak on spearguns, crossbows, knuckle dusters, clubs, coshes, batons or your favourite set of nunchuks.

Also banned are the ceremonial skene-dhu knife worn as part of traditional Scottish Highland dress as is the curved blade worn by Sikhs as part of their religious uniform.

Carnival Cruise Line in America recently imposed a lifetime ban on one Texas woman for taking a pack of CBD sleep-aid gummies onboard.

Melinda Van Veldhuizen, a 42-year-old mother of two, claimed she was treated like a criminal after the cruise employees found the gummies in her backpack at PortMiami.

“While certain CBD products used for medicinal purposes may be legal in the US, they are not legal in all the ports we visit and therefore are also considered prohibited items,” Carnival’s website states.

Like all international travel, security scanning takes place of all luggage and cruise lines reserve the right to confiscate any item, which they deem as dangerous or an instrument that can pose a risk to the vessel or its guests. 

That includes satellite disks, routers and other internet related equipment, plus boom boxes and large radios, as outlined on Carnival Cruise Line’s long list of acceptable and banned items.

You are allowed to take your metal detector with you, but only on shore excursions.

As for other noisy items, children excepted, musical Instruments are allowed by Carnival, however, if a noise complaint is received, the instrument will be confiscated and returned on the morning of debarkation.

“Guests must use earphones when listening to music or watching shows/movies on personal devices in public spaces,” it adds. “Bluetooth, portable and wireless speakers are only permitted within your stateroom and must be used respectfully and at reasonable sound levels and times of day.”

If you want to get around the deck quickly, you’ll have to walk as hoverboards, air wheels, scooters and segways are also on the banned list.

P&O also bans electrical items, which includes drones and power boards with surge protection devices. Surge protectors are set up for land-based electrical systems. Ships use a different electrical system and when these power boards are used onboard, they can cause damage to electrical items and can also be potentially hazardous, says P&O.

As for drinks, P&O permits plastic or glass bottled drinks including water and Tetra pack drinks and each guest can bring onboard a maximum of 12 canned drinks loosely packed in hand luggage. 

Earlier this year P&O Cruises overturned a ban on flying the Australian on short Australia Day cruises flag claiming it was a “misunderstanding”.