Will it fly?
Can you bring Brass Knuckles on a plane?
Coop checked the book. Here's the ruling for Brass Knuckles:
CARRY-ON
No
CHECKED BAG
Yes
What the TSA says
Although these items can be placed in your checked baggage, they are still illegal in some states. Should the bag need to be opened for some reason and there is an illegal item in the bag, TSA will be required to report it to local law enforcement.
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.