The police watchdog in the province invoked its mandate after a traffic stop in Kingsville led to injury.
The Ontario Provincial Police reported that an officer conducted a traffic stop in a parking lot in the area of Remark Drive and Main Street East, at around 1:40 a.m. Thursday.
"During the traffic stop, an incident occurred resulting in the driver sustaining an injury. Both the officer and the driver were assessed by Essex-Windsor Emergency Medical Service (EMS) at the scene," said Constable Chris Ciliska in a news release.
The 26-year-old driver was apprehended and taken to the hospital to be treated for a serious injury.
The Special Investigations Unit was notified and took over the investigation.
No other details have been released at this time.