Presence of officers can increase distress, according to a study in which people with lived experience suggest they could be talked down
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The police could be present in case they are needed while a health official who is running the interaction makes the call as to whether the person is having a crisis or a psycho.
The most important thing to keep in mind is that by the time the police or anyone shows up the psycho would have already taken a life. So by the time the police are there it is clear someone who has not yet attempted to harm someone is not a psycho just out to take a life.
