The police watchdog has found officers used excessive force in six incidents during last year's protest and occupation of Parliament's grounds.
In a report just released, the Independent Police Conduct Authority has summarised 17 investigations following more than 19-hundred complaints regarding the three week occupation.
It found a police officer's use of a fire extinguisher against protesters on the final day of the protest was in self-defence, but he and other officers were not justified in continuing to spray protesters after they'd turned their backs and were trying to climb down from a column.
Another officer used excessive force in punching an elderly man twice in the head in defence of a female colleague.
President of the Police Association Chris Cahill spoke to Midday Report.