You could try to call a prosecutor, however if your case is in Cook County, (especially the Daley Center) the chances of you getting in touch with a State's Attorney who actually would have access to your particular matter is extremely slim. In Cook County and other larger counties in Illinois, the traffic courts have 100s of tickets each day and it would be impractical for them to have your particular info readily accessible when you call. Basic rule of thumb in this situation would be to...
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Unfortunately you are at the mercy of the post office processing and the processing department at the secretary of state. You could try calling the MDDP/BAID department at 217-524-0660 to verify it has been received and that they have sent out the paperwork you need for installation. If they haven't received it as of yet and you made a copy of the MDDP form you mailed, you could pay them via credit card and fax the copy you made to them. For anybody who is looking to speed up the turnnaround...
You should verify with the court your case was in that you in fact have a felony conviction for aggravated assault. Sometimes background checks run by the numerous agencies will show that you were arrested for a felony and there may not be further information available to them to show it was reduced to a misdemeanor (they have no incentive to look into the matter more thoroughly). If you do have a felony conviction, then you should consult with the lawyer you had hired for the case to see if...
It is expungeable as long as you comply with the terms of your supervision, i.e. pay restitution and do the community service. However, the other caveat is that you have no criminal convictions on your record.