Never even thought about it but what laws do apply when you’re on a cruise ship.. 
(No I would never do a cruise. I like our planet and I’m to poor)
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Who in their right mind would go on a cruise in the middle of pandemic. They say that they test people but I'm pretty sure they just take people's word for it that they've been tested. Also, the tests are not 100%.
A cruise ship is a petri dish.
