Drain plug law.

[Farfrumbehavin]

Is it state law that the drain plug needs to be removed from the boat when it is being transported on the trailer ? A friend told me it is a new law. However, I have not read it or heard any notice on the news and was not informed of this when I registered my boat. Has this been a law all along and I just never knew and have been lucky I didn't get a fine? My boat and trailer have been inspected by people at the ramp but I have never been told to pull the plug.