I was on the Triumph about ten years ago and became friends with a large group of people who I had never met before. There was a young couple in that group that were pouring their own drinks on the Lido from a nondescript container. They were of age to drink but the crew stopped them and searched their room and found booze and other things that they smuggled aboard. Reportedly, their sail and sign cards were taken away from them for the rest of the cruise as a punishment. I'm not sure if there were extenuating circumstances involved that I was not aware of, because again, I didn't really know these people. However, I've heard you are not technically allowed to bring your own alcohol outside of your cabin.