Usually amounts under $50 are prosecuted as infractions even though they can be prosecuted as misdemeanors. You should work with your PD to have this one dismissed or reduced. Technically you have still violated your probation but you should not have to repeat classes and community service or pay fines all over again. A really mean judge could give you some jail time for violating the DUI probation but even that is unlikely. Not for $3.00.
The maximum jail time for a first offense DUI is six months. For a probation violation, the judge can give you anything up to that six months, minus credit for any time you already served, in addition to any time on the new case.
There's no way to predict how the case might resolve, or whether you can get a misdemeanor. It shouldn't affect getting your drivers license back (and the suspension should have been six months, not a year, unless you have prior convictions or were under 21 when you were arrested).
You need a real life lawyer, not advice from a stranger on the Internet who knows little about your case. Most public defenders are pretty good lawyers, but those who do petty theft cases tend to be the newest attorneys in the office and usually have huge caseloads. Since a theft conviction can screw up your future, you should seriously consider hiring an experienced criminal defense attorney if you can afford it.
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