For those that don’t know, every passenger (and perhaps even crew members) have what is called a MEDALLION. It is tracking device that shows where you are at all time.
There are even screens near the elevator where you can do a search for your traveling companions, or you can order something and they will bring it to where ever you are.
You need this device to open you cabin door so you must have it when you leave your cabin.
They know where he was up and until he took off the medallion or went overboard.
Have not seen that and doubt it’s true.
You may be referring to a totalitarian surveillance cruise somewhere.
What cruise line and ship is this supposed to be ??