Yes, my coworker said that the cruise line actually warned all of the passengers at the beginning of the cruise that date rape drugs were a continuing problem!
Then her grandmother got a drink at a ship bar, sitting in between two stranger older male passengers, started feeling really funny, and the last thing she could remember was someone yelling to get this lady a chair! She doesn't look good! And the next thing she knew she was waking up the next day in her cabin, shirtless.
They all hope that the person yelling was a crew member, and that he or she took the grandmother safely back to her cabin, where she took off her own shirt.
Apparently the date rape drugs are used for theft as well as sexual assault.