The Special Investigations Unit is looking into an arrest of a woman in Grand Bend.
Lambton County Ontario Provincial Police officers responded to a tavern on Main St. at 1am on Sunday and arrested a woman who was causing a disturbance under the Liquor Licence Act.
While in police custody, the woman reported an injury to police.
The OPP has notified the province's police watch dog, which will be investigating the incident.
Police will also be doing their own investigation.