Medical marijuana and cruise ships?

I am going to be going on a cruise from san diego to ensanada and I was wondering if my medical reccomendation will allow me to bring my marijuana on the ship? The cruise only makes one stop in Mexico and I wasn't planning on taking it off the boat at all I just wanted to know if I can take it with me on the boat? Anybody know for sure???

No, port authorities are federal, they won't recognize your med card as legal.

That sucks.

I for one always bring my own with us.We own a hotel in Cozumel and also travel extensively throughout Mexico.I usually put it in my checked baggage with a copy of my recommendation.LORD knows the shit they will try to sell you.
Helpful Hint:The locals call it Cafe.Not all the other bullshit names.

I have got my marijuana on a boat before, and it was a cruise from San Diego (Spanish for wales vagina). Just do your normal stashing routine as if you were taking a plane trip.... they do not have an intensive nor intrusive search policy (well the cruise line i took didn't), I hide a quarter in my pants.... well not that simple but i think you get the picture.... it was inside a oven-bag taped to the inside of my leg... quite simple really.

One side note, WEED on a cruise ship is totally worth it... sitting on the balcony smoking a J looking off into the open sea.... it can't get much more peaceful....