zero?
You understand police deal with the most vulnerable people at times of crisis in their lives? Often when other services have gone home for the night/weekend.
You understand the lengths I and others would go to daily to make sure people who consumed all kinds of drugs that would send them into psychotic meltdowns, excited delirium and efforts to kill themselves, were alive, many times a week. Or regularly people who had swallowed drugs prior to arrest, in attempts to conceal or take into prison?
You understand that many who die as a result of contact from police -a v broad term, were due to pre-existing health problems or suicide due to mental health crisis?
How exactly could it ever possibly be zero? It ain't a knitting circle.