A notice under s 9(1) of the OHSA need not specify the particular provision of the Act or regulations suspected of being contravened, but must sufficiently inform the recipient of the nature of the suspected contravention to enable assessment of the Authority's entitlement to the information sought. The widely-cited principles from the TPA s 155 cases (ANZ, Pyneboard, Bannerman) must be adapted to the specific statutory language of s 9(1), which differs materially from those provisions. Maxwell P's minority reasoning goes further, holding that s 9(1) notices need not demonstrate the validity of the exercise of power at all — the notice's function is merely to communicate the requirement.
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