These days, the cops can't keep people in jail who stabbed someone while high on meth. They aren't going to throw you in the clink if your piece of plastic has last month's date on it. Years ago, someone made up a sheet with all the transportation laws on it, and around the outside border was a phone number the cops could call to get information if they didn't know the firearms act. I keep a copy of that in all of my vehicles just in case I get pulled over and the cop won't believe that I know the firearms act better than they do. That said, I've never had to pull one out.