A DUI lawyer should have in-depth knowledge of the local courts and the way they work. These experts usually participate in a large number of court cases. They are familiar with what to say and what to do in a courtroom and how to behave to increase the chances of winning a process. Often, these professionals have good relations with the local judges and other participants of the legal system. Thus, they can provide a valuable piece of advice about what their clients should do after communicating with the jury.