I was arrested of criminal damage, and then dismissed when I meet with prosecutor. How can I expunge my criminal record?  I am in Arizona, I was arrested because I broke my bedroom door by mistake two weeks ago(I rent an apartment), and the police say it is criminal damage. Then when I met the prosector, I was dismissed. However, they told me there is still criminal record, and it shows dismissed. May I know how can I expunge my criminal record? Is there any possibility I can expunge the record myself, or I need to find a lawyer? 

Thanks.