36 If at the time he lost control of the vehicle, the plaintiff was driving a vehicle that belonged to the New South Wales Police Force I doubt that there would have been any submission that the plaintiff's employment was not a substantial contributing factor. One must remember that the underlying scheme of the Workers Compensation Act 1987, although much abused in recent time, is a no-fault scheme. Here, although it was his wife's car that he was driving, the plaintiff was using that car as a tool, implement or apparatus for the execution of his duty. He was using the vehicle to pursue the offender in order to seek to identify the offender's vehicle. That tool, apparatus or implement malfunctioned leading to the motor vehicle accident. However it does not matter whether a worker is using a tool of his own or a tool of his employer at the time of a work injury. As was rightly submitted, if a tree feller is using his own chainsaw or his employer's chainsaw it does not matter which chainsaw is being used, if the tree falls on the tree feller. Equally, it does not matter if a carpenter is injured whilst using a hammer to put nails into timber, whether the hammer belongs to the worker himself or to his employer. The injury in either case is compensable.