NSW Police Minister Yasmin Catley has been formally warned twice to close a loophole protecting rogue police officers – including over a year ago – but has taken no action.

The drawn-out investigation into police brutality at February’s anti-Herzog rally means officers who have broken important laws will avoid penalties.

NSW Police and its watchdog have closed ranks over "secrecy notices" issued by the Police Commissioner over Sydney's anti-Herzog protest.

The NSW Police Commissioner — who has said police “did what they needed to do” at the anti-Herzog protest — has the power to hide material under the “independent” probe.

Almost three months after Sydney’s Town Hall anti-Herzog rally, where police were filmed punching and attacking attendees, not one officer has faced any action.

The NSW Government’s highly-controversial anti-protest law has been struck down as unconstitutional by the state’s highest court, in a major blow to the ALP Minns Government.