Success Rate of the Insanity Defense

How often is the insanity defense successfully used in criminal cases? What factors contribute to its success, and how do courts typically evaluate claims of insanity in determining a defendant’s culpability?

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You’ve seriously misunderstood ‘guilty by insanity’ as a verdict.

Firstly - it’s not a case of ‘you have a mental illness and happened to kill someone’. It has to be proven that you committed this because of the mental illness and were not able to distinguish right from wrong. So in your example person A would not be killing someone ‘out of cold blood’. We are taking more like ‘genuinely believed this person was evil and needed to be stopped due to the severe delusions they suffered as part of their psychosis’. If someone with a psychiatric disorder commits a murder ‘out of cold blood’ they’re getting found guilty.

Next - the punishment. Being found not guilty by way of insanity you are saying someone should be detained in a secure forensic psychiatric hospital instead of prison(basically a psychiatric hospital for people who committed crimes so they’re still being detained but they’re also getting medical treatment) . It’s not a ‘not guilty off you go’ verdict

Hello pals,
The success rate for the insanity defense varies by jurisdiction and legal standards, but it’s generally estimated to be around 1% to 2%. This means that fewer than 1% of defendants who use this defense are usually successful.