As you have violated your probation, it will be up to the judge to decide what to do about it. You better have some good truthful excuses for missing all those meetings. I can't help you with costs; that is probably up to probation.
It depends on your progress and the reason you missed the classes. You should be able to get re-enrolled in the class and you may be able to get credits for the classes you did. There is usually a re-enrollment fee of about $60. Bear in mind that the judge does have the option of deleting the program requirement and sending you to county jail but that is usually done when the person has fallen out of the program a couple of times.
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You are facing a possible revocation of your probation for violating the terms of probation, i.e., not completing the DUI program. If it is a first time, most courts will revoke probation and reinstate it on the smae terms and conditions. You will be ordered to go back to the program. Do so as quickly as possible. You may be able to re-start from where you left off.
Any comments offered are not intended as legal advice. This attorney does not know the specifics of the particular case sufficiently to offer legal advice. You should hire a lawyer who can evaluate the details of your specific situation before offering advice.
Yes, you're in violation of your terms of probation and if you had obtained a restricted license, DMV will now suspend your license until your alcohol program is complete.
As for court, depending on the judge and how many other probation violations you do or don't have, you could be looking at anything from jail time, to additional community service, to merely being reinstated into the alcohol program.
You'll have to speak to an attorney who knows your court house to be sure of exactly what will happen. Some judges hand out jail time like candy for getting booted from your DUI program due to excessive absences.