Another important factor not mentioned above is the reason that the case was dismissed. Was the case dismissed because you completed the deferred...

I received a misdemeanor dui I showed up on my court date and they haven't filed anything how long do they have before dissmisal

It is possible that the law enforcement agency that arrested you has not provided the paperwork to the prosecuting agency. CHP is notoriously late...

Many arrest warrants are not even in the system and are simply being held by a particular law enforcement agency until they pick a person up. ...