Hi Dumbo,
When you say 'if the DUI charge is dismissed' , Do you mean the record was expunged OR You were arrested but not convicted.
In the former case since the court has expunged the record it is as good as having no record at all (atleast this is what the lawyer promise). In the latter case even though you do not have a conviction, you do have a police record, It is not deleted automatically.
-Sunny