I understand where the Court of Appeal is coming from here. The Legislature may well allow you to retrospectively withdraw your guilty plea -- for example, when you weren't advised at the time of the immigration consequences of that plea. But that doesn't mean that the state is barred from refiling those charges after the resulting dismissal. The statute doesn't expressly say that refiling is barred, and in some circumstances, I could totally understand why refiling would be permissible.
So the basic holding is something that doesn't seem to me out of this world. Under those circumstances, I can see why the Double Jeopardy clause doesn't necessarily bar refiling, the statute doesn't, etc.
But the situation here involves someone who's served his original sentence -- namely, probation. When the Legislature says that, after you've successfully served such a sentence, you can withdraw your plea and get the charges dismissed, it seems a bit bizarre to say that the state can then refile those same charges. And, to make matters worse, to say that the state can now refile those charges as a felony even though the California Supreme Court has said that "when a court has granted relief under section 17, subdivision (b), the offense is 'deemed a ‘misdemeanor for all purposes.’"
Doesn't it seem crazy to allow the state to refile the charges after you've served your entire sentence and to potentially now seek to incarcerate you for a longer period as a result of your successful petition under a statute that the Legislature passed to ameliorate the consequences of your prior conviction?
The Court of Appeal responds to that basic point by saying that "at this stage of the proceedings, whether the state may seek additional punishment is not before us." True enough, I guess. But that's the mountain that astrides the molehill. If the state isn't allowed to seek additional penalties beyond the ones that you've already served, then what's the point of allowing refiling? And if the point of the statute was to ensure that there aren't additional penalties, then it seems to me that allowing refiling would impermissibly conflict with the core purpose of the statute, and be improper even if the statute didn't expressly say whether such refiling was permissible or not. (That matters; just like preemption can be found even if its implied rather than express, so too can a statute sometimes require something even though the Legislature didn't pass a statute that contains those exact words.)
So it seems to me important whether additional punishment is allowed, even though the Court of Appeal doesn't feel like it needs to reach that issue at this point.
It seems to me like it nonetheless matters. A ton.