Officials such as the police are supposed to be trained how to deal with trans* people but it is nice to notice when they are respectful. I don't drink and drive (well - not much ...) and I've never been stopped. The nearest equivalent was the first time I ever had my bus pass checked, which was just after transition so I was still using my male pass. The inspector looked at it and said "This isn't right, is it?" so I put on my deepest pre-transition voice and said "I've only just changed my name and I haven't changed the photo yet". He almost threw the pass back at me and moved hastily on to the next row.