According to Uncle Sam my hands and feet are registered as deadly weapons.
Contact the Cruise line, But I would bet dollars to donuts that you will not be allowed to take a weapon on the ship and definitely not off the boat in Cozumel.
The Cruise I took from Seattle to Alaska along the inside passage had metal detectors getting on and off and has the same rules as the airport. "knives and such".
US Army states otherwise. , maybe not "registered" but on file.
There is no law, rule, regulation, or statute that requires anybody to register any part of their body as a lethal weapon. Even if there were it would be pointless because there is no procedure. And what would be the point? So we can track the movements of your hands?
Knives are not weapons they are tools. I would feel lost without my knives. Is it the same for all ships? Now I don't know if I want to take a cruise.
US Army states otherwise. , maybe not "registered" but on file.