Some states do not allow for the expungment of DUI's, however some do and MD is one of them. Depending on the circumstances of your conviction. it may be automatically expunged after 3 years. Even if you do not quality for the this type of expungment, you may be able to manually have your record cleared. It gets a bit confusing so here is a link to the MD DMV website. You will find information explaining this further:http://www.mva.maryland.gov/about-mva/info/26100/26100-21T.htm