Police forces conducting their own investigations is like me conducting my own tax audit.
Here in Ontario we have a group called the Special Investigations Unit:
Quote:
The SIU is a civilian law enforcement agency with a consequence-based jurisdiction to conduct criminal investigations. The SIU investigates incidents involving the police and civilians that have resulted in a serious injury or death.
Complaints involving the conduct of police that do not involve a serious injury or death must be referred to the appropriate police services and other agencies such as OCCOPS (Ontario Civilian Commission on Police Services)
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What that blurb doesn't mention is that by law they MUST investigate every single incident involving police resulting is serious injury or death. Even if it's a non-emergency car crash, they investigate.