Crime is often an act of desperation. It's nothing that the person would have done if he or she had not had outside factors to consider. There is a very interesting connection that can be found when looking at drug crimes, as the use of drugs and the need for money to purchase more often leads to other crimes.
If you're driving and you're too tired, it wouldn't be hard for a police officer to assume that you were under the influence of alcohol. After all, a lot of the signs that police are looking for show up when you're tired, as well.
There are many different ways that someone can defend against a DUI charge, even though it may seem like an impossible feat. Sure, the stigma of a drunk driving offense may make someone seem guilty until they are proven innocent, but as we all know, that saying is actually the other way around.