Tom Campen alleges he was beaten by two RCMP officers at a bar in Creston last October.
He says he stood up and spoke to the officers who were attempting to arrest the woman sitting next to him. Campen suffered serious facial injuries and a broken rib, and was transported to hospital for treatment.
The Independent Investigations Office announced Tuesday it is forwarding its report on the matter to Crown counsel.
The IIO said it had determined that Campen's injuries constituted serious harm.
It is now up to Crown counsel to decide what charges, if any, should be laid against the officer the IIO believes was involved.
It's the first time the IIO, which investigates incidents of serious harm or death involving police, has found possible wrongdoing by an officer since it began operations last September.