If my OUI was dismissed, why do I still have to attend driver education classes and get an ignition interlock device?

Question Details:

I had a second offence OUI and to make a long story short, the police department didn't do their job correctly. My case was dismissed by the district attorney when the police department's evidence was thrown out by the judge. Basically not being proven guilty and "getting off" why do I still have to attend DEEP (Driver Education and Evaluation Program) and get one of those devices on my car ignition? Why if my case was dismissed and I'm  "not being guilty" do I have to go through everything but jail time to get my license back?I can't really grasp this concept. Am I not, for the most part, found innocent by not being proven guilty?

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