Definition of Imperfect and Perfect Defenses

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As stated previously, a defense can reduce the severity of the offense, or completely exonerate the defendant from criminal responsibility. If a defense reduces the severity of the offense, it is called an imperfect defense. If a defense results in an acquittal, it is called a perfect defense. The difference between the two is significant. A defendant who is successful with an imperfect defense is still guilty of a crime; a defendant who is successful with a perfect defense is innocent.