It is not uncommon for DUI cases to be dismissed in Arizona. There are a number of reasons why this may happen, including errors by the police, lack of evidence, or successful completion of a pretrial diversion program. In some cases, the charges may be reduced to a lesser offense.
Dismissed DUI cases typically involve problems with the arresting officer's conduct, the sobriety tests that were administered, or the blood alcohol test results. If there is insufficient evidence to prove that the driver was impaired, the case may be thrown out. Additionally, if the driver completes a pretrial diversion program successfully, the charges against them will usually be dropped.