Hansam: "Bear in mind that even if you're in the People's Republic of New York they still don't have the right to board and seize unless they have reasonable suspicion."
You are suscepible to random boarding to check for adequate life preservers, approved signalling devices, etc etc. In fact these boardings are rather routine. Other illegal objects may be found, so don't feel too safe...
The searches are sometimes extensive. I'm a NY resident.
Cogito, ergo armatum sum