We have cruised several time before and have gone thru airline security but still do not know the answer to this.
Do passport/ticket holders that are generally worn around the neck pass thru the security OK. I am not comfortable having to put cash, passports, tickets, etc. in my carryon or exposed openly in the tubs that go thru the xray machine. The one I have is non-metal as not to set off the alarm.
When I traveled earlier this month, I was always told to remove my neck wallet before passing thru the metal detector. I had to put it in one of those tubs. They will tell you to take it off before passing through.