According to The Law Dictionary, a DUI conviction is a permanent part of an individual's criminal record. Although laws vary among states, most have processes in place to remove or conceal certain criminal convictions.
The Law Dictionary explains that removing, or expunging, a conviction from a criminal record is a complicated and lengthy process. A conviction is more likely to be expunged if it is a misdemeanor, a first time offense and no one is injured or killed. Even if the process is successful, some agencies can still access an expunged conviction. It is best to consult an attorney regarding the laws and process in each state.