The Alberta Serious Incident Response Team was asked to investigate what happened on March 8, 2014, when an officer responded to a complaint of an intoxicated man.
The man was refusing to leave a Subway shop inside a Mac's convenience store.
ASIRT says the officer "had contact" with the 45-year-old man, who suffered a complex facial fracture needing hospitalization and surgery.
ASIRT says no weapon was involved.
Police say Const. Sean Briegel, a four-year veteran, has been placed on administrative duties.
ASIRT investigates incidents involving police that have resulted in serious injury or death.