To beat a dui, several defenses are available and may work to reduce or eliminate penalties, fines and other costs related to your arrest. Always consult with a qualified DUI attorney to protect your rights. One defense is termed 'necessity', or the assertion that, despite being drunk, it was medically or otherwise necessary to drive. Another is duress, which states that you drove while under the influence to avoid some type of injury or death. A third is entrapment, implying a police officer requested that you drive drunk. A fourth is called 'mistake of fact', or an honest belief that you were not so drunk as to be over the legal limit. Finally, you might use the defense of involuntary intoxication, stating you drank alcohol without your knowledge.