Government Insurance Office of New South Wales v Colgate Palmolive Pty Ltd

The Government Insurance Office of New South Wales (GIO) appealed a decision of the Workers Compensation Commission concerning the liability of an employer, Colgate Palmolive Pty Ltd, for a worker's condition. The dispute centred on whether the worker's employment had contributed to the onset or aggravation of his condition, and consequently, which insurer was liable to indemnify the employer.

The primary legal issues before the Court of Appeal were whether the worker's employment involved exposure to risks that caused or aggravated his condition, and if so, how to determine the liability of insurers when multiple policies might have been in force over the period of employment. Specifically, the court had to consider the relevance of actual causation versus the mere risk of causation in establishing an insurer's liability, particularly in cases of diseases with gradual progression or cumulative causes, and the impact of factors like smoking on the assessment of employment-related risk.

The court affirmed that for an employer to be liable, the employment must have contributed to the disease or its aggravation. It was held that the relevant inquiry was whether the employment exposed the worker to a risk of contracting the disease or aggravating an existing condition, rather than requiring proof of direct causation. The court applied the principles established in previous cases concerning occupational diseases, emphasising that the cumulative effect of employment over time, even if the disease manifested later, could establish liability. The court also considered the effect of smoking, finding that while it might increase the risk of certain diseases, it did not negate the employer's liability if the employment itself contributed to the condition.

The appeal was dismissed, with the Government Insurance Office of New South Wales ordered to pay the respondent's costs of the appeal.