all is I know is that i've been on the ferry a bunch of times and had plenty of weed on me. I've never had an issue. I used to blaze in my car on the ferry too but you never know what asshole is working that day so I stopped doing that. I was more worried about riding the ferry with a box full of fireworks than i ever was with a box full of weed.
I've heard the same thing about the dogs too. My buddy is miliary police and has been thru dog training school there. He said most of the time if the cop dog is a shepard then it's not a drug dog. The one time years ago I got pulled over and popped for weed, the patrol brought a drug dog out to my car for a search. That dog wasn't a Shepard either. I think most of the dogs at the ferry terminals are german shepards, though i'm not sure how much that really has to do with anything. It's all just hearsay on my part.