How long is the probaton for a 1st D.U.I misdemeanor(California) and how can a violation be expunged? ?

Typically, can be obtained 5-7 years after the offense. You will have to have some time crime free, so you can prove to a judge that you have really changed. In order to get an you will need to hire a lawyer. Helpful fact are granted about never. I heard like somewhere in the area of only 1% are granted. Besides this is just a misdemeanor, so it will not effect you much in the future.