Hello, this is Attorney Park.
In criminal cases, a defendant’s mental condition can sometimes change the outcome entirely.
If someone commits a crime while in a state of insanity—meaning they completely lose the ability to tell right from wrong—the law may decide that the person is not guilty.
But if the person still has some judgment left, even slightly, the court might only reduce the sentence instead of finding them not guilty.
The difficult part is this: figuring out where that line lies between insanity and mental weakness.
It’s not only a medical question but also a legal one.
That’s why, when a defendant’s mental state is unclear, the court should always rely on a psychiatric evaluation by a medical expert before making its decision.
Let’s look at a real-life example to make this easier to understand.
The names of the people involved have been changed for privacy, and some details of the original court case have been adapted.
(Reference case: Supreme Court Decision 98Do○○ [Injury to a Lineal Ascendant])
A Case of Schizophrenia and Sudden Violence
John(Pseudonym, Defendant) had been suffering from catatonic schizophrenia, a condition known for sudden and intense emotional outbursts.
Years before, he had even set fire to his home while in an insane state and was later sent to a mental hospital for treatment under a medical custody order.
After several years of treatment, doctors decided he had recovered enough to be released.
However, after his release, John’s symptoms gradually returned.
He continued taking medication provided by the treatment center but could not afford consistent psychiatric care.
In 1997, after suffering from headaches, John’s mother gave him some herbal medicine.
When his pain worsened, John lost control, striking his mother and injuring her seriously.
She needed about eight weeks of medical treatment.
The Lower Court’s Decision
The trial court found that John was suffering from mental weakness, not complete insanity.
It sentenced him to eight months in prison, acknowledging his mental condition but still holding him criminally responsible.
The appeals court agreed.
The Supreme Court’s View: “The Judgment Was Not Thorough Enough”
However, the Supreme Court of Korea disagreed.
It noted that John had a long history of mental illness, and his behavior during the incident was consistent with his previous psychotic episodes.
Yet, the lower courts had not conducted any new psychiatric evaluation at all.
The Supreme Court ruled that this was a serious procedural flaw.
When the defendant’s mental state is uncertain, the court must first obtain a thorough psychiatric evaluation—examining the type, degree, and effects of the mental disorder.
Then, based on that expert opinion, the court should analyze all circumstances surrounding the crime—such as how it happened, the defendant’s behavior before and after the event—and decide whether the defendant was legally insane at the time.
If the evaluation shows that the defendant had completely lost control over their actions, the correct verdict should be not guilty.
The Supreme Court also emphasized something very important:
Even if the crime resulted from mental illness, simply sending the person to prison is not enough.
If the defendant still suffers from a mental disorder that could cause similar behavior again, the court may ask the prosecutor to request a medical custody order—so the defendant can receive proper treatment in a secure environment.
This system is not only for the defendant’s rehabilitation but also to protect society by preventing future offenses.
In the end, the Supreme Court overturned the lower court’s decision and sent the case back for retrial, saying that the court’s finding of “mental weakness” without expert evaluation was unlawful.
This case reminds us that when mental illness is involved in a crime, the issue is not just about confinement—it’s also about treatment and justice.
Before labeling someone as simply “mentally weak,” the court must carefully investigate their mental condition with professional help.
Because in the end, justice should not only be about punishing wrongdoers but also about understanding the human condition behind every crime.
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