Definition. At the end of a criminal trial, a finding by a judge or jury that a defendant is not guilty. An acquittal signifies that a prosecutor failed to prove his or her case beyond a reasonable doubt, not that a defendant is innocent.

What causes an acquittal?

A verdict of not guilty constitutes an acquittal. In other words, to find a defendant not guilty is to acquit. At trial, an acquittal occurs when the jury (or the judge if it's a judge trial) determines that the prosecution hasn't proved the defendant guilty beyond a reasonable doubt.

What happens when the defendant is acquitted?

An acquittal results from a not guilty verdict and cannot be appealed by the prosecution, overturned by the judge, or retried. When there is a mistrial, however, the case may be retried. Since the 1824 case of United States v.