Don't lose your composure or use bad language when dealing with police officers.
Police officers are in charge when they stop you and begin an investigation for DUI-DWI. Most stops are in the middle of the night, when you are already tired. It is very easy to lose your composure or use harsh or bad language if you are stopped, especially if you think you have done nothing wrong. You may be upset, and the officer may not be willing to listen to explanations from you. In their eyes, you are either breaking the law or you are not. Excuses do not register with the officer.
Assess the situation before you speak.
Take a deep breath and decide whether you need to talk at all. Remember that everything you say or do is likely going to be recorded. You may be technically correct that the officer is not treating you well. However, the jury or the judge is not going to think highly of your bad language if you lose your composure. In their eyes, that is another sign that you may have been intoxicated or guilty of whatever offense the officer has charged you with.
Think of what the Jury may see.
In the brief minutes of your traffic stop, or the hours during the processing of your arrest, you MUST be on your best behavior. Jails also have interior cameras which may show up at trial. Always think of how you will appear to a jury. Getting mad or cursing at any law enforcement officer or jailer will almost always guarantee that the chances of obtaining a good result in your case will be diminished.