来源：百度文库 编辑：中科新闻网 时间：2021/10/24 14:49:41
To convict a criminal defendant, the prosecutor must prove the defendant guilty beyond a reasonable doubt. As part of this process, the defendant is given an opportunity to present a defense. There are many types of defenses, from "I didn't do it" to "I did it, but I was too drunk to know what I was doing."
All people accused of a crime are legally presumed to be innocent until they are convicted, either in a trial or as a result of pleading guilty. This presumption means not only that the prosecutor must convince the jury of the defendant's guilt, but also that the defendant need not say or do anything in his own defense. A defendant may simply remain silent, not present any witnesses, and argue that the prosecutor failed to prove his or her case. If the prosecutor can't convince the jury that the defendant is guilty, the defendant goes free.