With much fanfare, freedom loving Americans embraced The Drug Trafficking Vessel Interdiction Act of 2008 which makes it illegal to operate a semi-submersible type of vessel regardless whether illegal drugs are found.

 

 

I certainly hope you are being sarcastic, Xylene.  Clearly if you have a sub and operate within the legal bounds (e.g. allow CG to inspect and aren't running coke) then you have zero to worry about.

 

On the other hand - if you happen to sink your sub right when the CG approaches after a challenge they are likely to press charges.

Unidentified sub inside the US sea-frontier?

 

At the inquiry:

 

"It was an un-identifed  submarine that refused to heave to and answer challenge inside our waters . Per orders we sank her as a pirate. Regrettably no survivors."