As long at the doe did not jump out of your vehicle on the way out (which would indicate it was an alien or something), and it looked healthy otherwise, I don't think you have anything to worry about. Cook the meat well, as you should always do. That is what I would do anyway. If it was sickly looking and skinny, then CWD would be an issue - see http://www.dnr.illinois.gov/programs...ages/faqs.aspx if this is the case.