Police investigative immunity from civil liability extends to purely ministerial tasks such as completing forms with court dates, because even ministerial tasks involve decisions as to priorities in the deployment of resources and there is no bright line between administrative and investigative tasks. The DPP's failure to comply with prosecutorial guidelines requiring a request for priority analysis is protected by advocate's immunity where the failure occurred in the course of in-court proceedings. A prisoner's total dependence on police and prosecution authorities to secure their release does not give rise to an implied assumption of responsibility; dependence and vulnerability confuse capacity with obligation.
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