When IBAC issues an immediate attendance summons under s 124(2) of the IBAC Act, the decision-maker is not required to weigh the prejudice to the summoned person; the legislature has struck its own balance between procedural fairness and investigative integrity. The reasonable grounds requirement involves predictive opinion and judgment informed by investigative experience, and the onus of establishing the absence of reasonable grounds lies on the challenger. Foundational facts identifying categories of prejudice to the investigation (such as risk of collusion, disruption to investigative sequence) are sufficient without detailed elaboration.
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