For your safety, don't do it.

I love sailing myself- I'm currently limited to my fucking tiny ass sunfish but in the market for my dream singlehander, a little San Juan, in the spring. Your problem is that the Coast Guard has more power of search than the land cops and Customs combined, as they are functionally cops, customs, INS, safety inspectors, fish-n-game enforcers, etc... and they need NO reason beyond performing a safety inspection to come aboard and root around in your bilge. And you could land yourself in an ASSLOAD of shit going in and out of international waters, and crossing state lines, with a cargo of pot, live or otherwise, and live is harder to hide.
How do I know this? Guess what branch my military service was in?

Happy sailing, and most important- SAFE sailing!