Carnival Cruise Line is threatening rowdy passengers with a $500 fine to tackle increasingly bad behavior on board its ships

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• Carnival Cruise Line said disruptive guests face a $500 fine, detainment, and disembarkment.
• The warning applies to passengers whose behavior impacts the enjoyment and safety of those on board.
• There are a higher number of passengers with "more agitated behavior," Carnival said.

Carnival Cruise Line...