A coroner's inquest into police use of force has heard from the first witness.
The inquest is looking into three separate cases of police shooting and killing a mentally ill person in a confrontation.
In each case, the victim had approached officers with a sharp object in hand and refused to put the weapon down.
29-year-old Michael Eligon died in 2012 after he ran off from a hospital dressed in a gown and armed with two pairs of scissors.
25-year-old Reyal Jardine-Douglas died in 2010 after he pulled a knife on officers on a bus. 52-year-old Sylvia Klibingaitis confronted officers with a knife outside her home after she called 911 saying she was going to commit a crime.
In court on Tuesday, the presiding coroner Dr David Eden asked the five jurors to keep an open mind. He said that a person should not be defined by his or her mental illness and that police officers should not be defined by their actions.
Dr Eden told the jurors that they are not being asked to lay blame in the individual cases. They are being asked to make recommendations, if they think it's necessary, on changes to police training and availability of tools of weapons to try to prevent future deaths.
The first witness on the stand was John Weiler of the Ontario Police College. He explained how officers are trained on use of force.
Weiler told jurors that when officers are assessing a situation and making a plan of action, they are considering a person's behaviour and not the motivation behind that behaviour, like a mental illness.
That part of Weiler's testimony worried Peter Rosenthal, lawyer representing Eligon's family.
Rosenthal says an officer has to consider a person's mental state and how to alter how they interact with that person.
"Maybe that's the central problem," he says.