About 90% of people suffer from drug-resistant schizophrenia and stop relapses of antipsychotic drugs after two years, and the Crown Survey heard a survey of Joel Cauchi’s mental health and care.

The investigation is scheduled to be fatally stabbed by six people in Westfield Bondi Junction in April 2024.

Cauchi, 40, killed Ashlee Good, 38, Jade Young, 47, Jade Young, 27, Pikria Darchia, 55, Dawn Singleton, 25, and Faraz Tahir, 30, and was shot and killed by police officer Amy Scott on April 13 last year and was injured in a shopping mall on April 13, 10.

The coroner's court heard that at that time, Kuch was not treated with medication for his schizophrenia. He was once weaned the medication by a psychiatrist and should have been monitored but not.

On Thursday, the survey heard from a team of psychiatrists who provided expert advice on Kuch's care and treatment.

The court was told that clozapine (which may have serious side effects) is generally considered a lifelong drug, and for patients with drug-resistant schizophrenia, the high recurrence rate is 77% after one year, compared with 90% after two years, for those who stopped taking it.

Psychiatrist Professor Olav Nielssen told the court that homicides against strangers by schizophrenia are rare and occur in New South Wales about every two years.

He said, “the characteristics of that group” were taking medication and being homeless. Cauchi was unmaterial and homeless when stabbed at the Bondy junction.

"Most schizophrenia patients will never commit serious violence, but there are psychiatric patients who commit disproportionate homicides," Professor Merete Nordentoft, a Danish psychiatrist, told the Sydney court.

Nordentoft said those who hurt others often have delusions, including thinking they are “being followed, someone trying to hurt you, so you need to protect yourself.”

In Copenhagen, there are clinics supporting patients who want to get rid of antipsychotics. Patients were monitored for 18 months a week.

However, psychiatrists told the court that most people found that they could not completely end the medication.

“In fact, patients are more receptive to the need for this treatment,” she said, noting that there is a silver lining of the process.