Where a plaintiff alleges negligence based on exposure to a workplace substance, expert evidence is required to establish that the substance creates a foreseeable risk of injury if that risk is not within common knowledge; common sense alone is insufficient to establish that woodchip dust inhalation poses a risk of lung damage. Under s 9(1) of the Workplace Health and Safety Act 1989 (Qld), it is not practicable for an employer to guard against a risk of injury that was not known or required to be known by it.
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