DUI is a felony isn't it, so wouldn't you have court records that show up?
Court records are retained forever, and they are public information. Any conviction will show up if someone looks for it. Companies that
background search criminal records
for employers make a practice of collecting this information from every state and county in the USA. Even if you get a conviction expunged, the private companies will still have it in their databases. Your DUI will show up. The best policy is to admit to it if a job application asks for misdemeanors. If the application only asks for felonies, they answer accordingly. However, a 2nd DUI, or a DUI combined with an accident is usually a felony.
If the application asks about misdemeanors, and you do not admit to the DUI, then you will be both, convicted and a liar. It is much better to be truthful. Then have an explanation ready that is honest but puts you in the best light.