An acquaintence of mine was pulled a couple of years ago for wearing his DR helmet. He went through the 'grandfathers rights' stuff with the Officer but was left in no uncertain doubt that he was breaking the current law - and that as far as the Officer was concerned was the end of the matter, current law. However, he didn't give him a ticket, just told him to make sure he wasn't caught using it again. I make no stance on this at all, except that I would always follow every written law that is published LOL.