Police Car parked on Disabled Parking Space

Below picture was taken on 13 March 2009. Firstly we were just feel abnormal that a police car was driven by a disabled person. Then we saw the policeman did some shopping in Woolworths, Campsie. A little bit curious that if a police car really has priviledge to park at disabled parking space without any special reason. As on that day, that police car just was used for shopping rather than special public service.