A DUI trial is like any other trial, it involves both sides presenting evidence in the form of documents and testimony to support their case. Each side will make an opening statement telling the judge or jury what the evidence will reveal. The prosecution will call certain witnesses, generally a police officer and lab technicians that performed BAC tests. The defense can cross-examine these witnesses and this is where most DUI cases are won or lost. How skilled your attorney is at cross-examination is very important. If the case is not dismissed by the judge, then the defendant can call witnesses as well. Finally, once all the evidence has been presented, each side gets to make closing arguments where they get to argue to the judge or jury the meaning of the evidence presented at trial. After that happens, either the judge or the jury will deliberate and render a decision. The verdict is read in open court. If the defendant is convicted, the case does not end there. The defense attorney can file post-trial motion and even an appeal.