I was aboard a Carnival ship (paradise) out of FLL in Nov, and My wife had her DK in her checked baggage. No problem with the Airlines getting there from CA, but when we got aboard and into our room, we had a message in our room to come down to the bowels of the ship. We were worried as we had hidden some gin in our bags and that is a no-no. When we got down below in some cargo part of the ship, they asked us to follow the security person off the ship. This was not looking good. We followed him off the ship, and they never told us what the problem was ," just follow us sir" Kinda thing. when we got onto the pier, they took us over to where the checked bags are checked aboard, and asked us to ID our bags. After we had done that, they tore through it and asked us if we had anything to declare, so we came clean. They found the DK, and confiscated it. We had to go ashore at every port, and they would give it to us, then we could/must give it back, prior to boarding the ship or the tenders.. They were very serious about that. I found it funny that they thought someone might be able to take over a cruise ship with a knife, yet reassuring as well knowing they are doing a very thorough job. Funny thing was, booze is not allowed onboard by the Cruise line, but the bags were searched by the TSA people, so they could give a rip if they find booze, they are only concerned about weapons/explosives, Etc. We didn't even bother with the knife during the trip as it was a pain to go get it, and when we got off at the end, we picked it right back up, and we were on our way. no problems.