Why do people plead not guilty by reason of insanity?

Asked by: Prof. Demetrius Quigley  |  Last update: June 8, 2025
Score: 4.4/5 (32 votes)

The insanity defense, also known as the mental disorder defense, is an affirmative defense by excuse in a criminal case, arguing that the defendant is not responsible for their actions due to a psychiatric disease at the time of the criminal act.

Why is not guilty by reason of insanity a thing?

“Not guilty by reason of insanity” is a plea by a criminal defendant who admits the criminal act, but claims that they were mentally disturbed at the time of the crime and lacked the mental capacity to have intended to commit a crime.

Why is the insanity plea good?

Fairness and justice

One of the primary advantages of the insanity defense is that it allows for a more just outcome in cases where the defendant's mental state significantly impaired their ability to understand the consequences of their actions.

How many people plead not guilty by reason of insanity?

Insanity can be extremely difficult to prove. In fact, less than 1% of defendants in criminal cases plead insanity as their defense in the United States, and only about . 26% of those who plead insanity are successful in their plea, according to the same source.

What is the outcome for most individuals found not guilty by reason of insanity?

Defendants found not guilty by reason of insanity are not simply released. Instead, they are usually transferred into the custody of a psychiatric facility or other mental health institution, often for a longer period than defendants convicted and sent to prison for the same offense.

How does pleading 'not guilty by reason of insanity' work?

42 related questions found

Does pleading insanity reduce your sentences?

So, while pleading insane may possibly help you with an acquittal of your charges, that does not mean you will not be sentenced to long-term in-patient treatment. This is, compared to if you did not plead insanity and were convicted of a crime.

What famous cases were found not guilty by reason of insanity?

The Hinkley-Reagan case

In 1982, John Hinkley was found not guilty by reason of insanity for the attempted assassination of President Ronald Reagan. The verdict was greeted with outrage and calls for radical reform of the criminal justice system.

Who has won an insanity plea?

A
  • Michael Abram.
  • Adélio Bispo de Oliveira.
  • Edward Charles Allaway.
  • Marcelo Costa de Andrade.
  • Iván Arancibia.
  • Jeffrey Arenburg.
  • Alexander Astashev.

Which well-known individual was eventually found not guilty by reason of insanity?

The man who shot and wounded President Ronald Reagan in 1981 was freed from court oversight just last week after decades in a Washington mental hospital. John Hinckley Jr., who was charged with attempting to assassinate the 40th president, was acquitted by reason of insanity.

What are the criteria needed to plead guilty by reason of insanity?

The definition of insanity is similar to the M'Naught criterion above: "the accused is insane, if during the act, due to a mental illness, profound mental retardation or a severe disruption of mental health or consciousness, he cannot understand the actual nature of his act or its illegality, or that his ability to ...

What is a verdict of not guilty by reason of insanity results in?

Note: A verdict of not guilty by reason of insanity usually results in the commitment of the defendant to a mental institution. Such a verdict, however, may allow the defendant to be released, sometimes into the custody or care of another (as a family member).

What are the four types of insanity?

Different states have adopted different standards to determine whether an accused person is legally insane. These include (1) the M'Naghten Rule; (2) the "Irresistible Impulse" test; (3) the "Durham Rule"; and (4) the "Model Penal Code" test.

Can you plead insanity with schizophrenia?

If a person that suffers from schizophrenia injuries another individual because his thoughts led him to believe that his life was in danger, this may potentially be viable grounds for a defense of insanity. “Insanity” is a legal term.

Does pleading insanity work?

And how often does it succeed? Although cases invoking the insanity defense often receive much media attention, the defense is actually not raised very often. Virtually all studies conclude that the insanity defense is raised in less than 1 percent of felony cases, and is successful in only a fraction of those1.

Does not guilty by reason of insanity show up on background check?

A finding of "not guilty by reason of insanity" (NGRI) will show up on a background check. It is not the same as a simple "not guilty" acquittal. A verdict of NGRI also means that the person loses their right to own or possess firearms.

Can a mentally ill person testify in court?

It noted that a mental patient may not testify regarding his or her ill- ness, but may testify on other matters. The U.S. Supreme Court quoted a British case in which an ill person thought that there were thou- sands of spirits inside him.

What is an example of not guilty by reason of insanity?

Bobbitt argued that she suffered years of abuse and was sexually assaulted by John Bobbitt, which resulted in her snapping and cutting off his genitals. The jury found her not guilty by reason of temporary insanity. Bobbitt was ordered by a judge to go through a 45-day evaluation period in a mental hospital.

What is the success rate of the insanity plea?

The Insanity Defense in Practice

Despite public fears, defendants do not abuse the insanity defense. In felony cases, the defense is invoked less than 1% of the time, and even when it is employed, it is only successful 25% of the time.

What is the magneton rule?

The M'Naghten rule requires that, should a person who commits a crime be unable to recognize that the crime is morally or legally wrong due to mental disease or mental defect, they should be found not guilty by reason of insanity.

What is innocent by reason of insanity?

“Not guilty by reason of insanity” is a plea entered by a defendant in a criminal trial , where the defendant claims that they were so mentally disturbed or incapacitated at the time of the offense that they did not have the required intention to commit the crime, and are therefore not guilty.

What makes someone legally insane?

Legal insanity requires that the person, by reason of mental disease or defect was incapable of either: Knowing the nature of his or her act. Understanding the nature of his or her act. Distinguishing between right and wrong at the time of commission of the crime.

Can you plead insanity with bipolar?

A: People with conditions like schizophrenia, bipolar disorder, and schizoaffective disorder may qualify for the insanity defense in certain cases.

What is the most famous plea of insanity?

One of the most famous uses of the insanity defense in the U.S. came in United States v. Hinckley , concerning the assassination attempt against then-President Ronald Reagan.

What almost always happens to a defendant who is found not guilty by reason of insanity quizlet?

A defendant who is found not guilty by reason of insanity is almost always: ​committed to a mental institution. ​The "substantial capacity" test has a lesser requirement.

What was not guilty by reason of insanity changed to?

The Bill C-30 amendments also modernized some of the language which had been used in the Criminal Code for over 100 years. “Not guilty by reason of insanity” was changed to “not criminally responsible”.