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DUI defense requires a thorough evaluation of an individual's case and the entire circumstances surrounding the matter. Accordingly, it's absolutely essential that a DUI defendant retain an attorney so that the attorney can evaluate the details of the matter.
However, in some instances, an attorney can successfully challenge a DUI, suppress evidence, and, if the police really messed up, occasionally a DUI can be dropped or reduced to a lesser charge. Examples can include:
1. breathalyzer wasn't properly calibrated;
2. individual rendering the test wasn't properly trained;
3. the test is unreliable for some reason (possibly foreign substances in the mouth, though that would require expert testimony);
4. improper supervision of the defendant prior to the test;
5. unlawful stop (for instance, if the police didn't have a reason to stop the defendant).
However, there's no way to provide an exhaustive list, as there are many factors in a DUI case. For that reason, retaining a defense attorney can be a great investment.
While I can control the quality of an answer, my control over the content of an answer is restrained by the truth. Please do not shoot the messenger.
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