Euthanasia campaigner Philip Nitschke says he feels "pretty violated" after police seized his phones, computers and other items as part of an investigation into the death of a terminally ill man.
Dr Nitschke on Friday was accompanied by his lawyer Michael Woods when he was interviewed by police investigating the death of Max Bromson who took his own life early on Monday.
Dr Nitschke told AAP no charges were laid, but "we are just waiting until they make the next step".
Mr Bromson, who ran for the senate last year for the Voluntary Euthanasia Party, died in a Glenelg motel room surrounded by family members.
The former businessman, who suffered from a rare and terminal form of bone cancer, said he lived with chronic, excruciating pain and wanted the right to end his life peacefully at the appropriate time.
Dr Nitschke has said Mr Bromson took an imported drug which had been tested at Exit International laboratory at Gilberton in Adelaide.
He told AAP detectives took his phone at the interview and told him police were at the Gilberton premises.
He returned to the address with his lawyer as police spent about three hours searching the premises before taking "a lot of items" including laptops.
"The infrastructure of the organisation has been crippled by this," he said, describing the police actions as unnecessary and heavy-handed.
"I feel pretty violated."
After police were notified of the death, detectives confiscated the family's mobile phones, tablets and laptop computers.
Dr Nitschke said, like them, he had been told it could be up to two years before the property was returned.
Police are investigating whether any criminal offence involving assisting in a suicide had been committed.
Last week, Dr Nitschke was suspended by the Medical Board of Australia which ruled he posed "a serious risk to the health and safety of the public".Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14 or the Suicide Call Back Service on 1300 659 467.