I just got back from a 7 day cruise aboard Caribbean Princess (southern caribbean) with my girlfriend. It started and ended in San Juan, PR, and upon disembarking, both of our cruise cards sounded an alarm instead of the normal "ding" and we were told to step aside while the other passengers continued disembarking.

We were escorted off of the ship with no explanation, told to collect our luggage (which was already separated from the other passengers' luggage), and taken directly to customs. The officer asked us a few questions, and searched our luggage. The process only took a few minutes, but we were never given an explanation. The silver lining is that we got to skip ahead of the line and were given free bus transfers to the airport.

Has this happened to anyone else? Was it just a random search?