Likewise, their refusal to investigate another 56 unlawful interceptions was "reasonable" because it was based on the Inspector-General of Security and Intelligence's view that metadata spying was "arguably legal" (if you ignore the then-clear prohibition against domestic interceptions, the definitions of "communication" and "intercept", and all parliamentary intent). Given this view, the police could not conclude that the interceptions were "unequivocally unlawful" - a far higher standard than they ever apply to any of us - and "criminal prosecution of individuals in an attempt to clarify an inherently uncertain law would have been unjustified" (something which again they have no trouble doing when the target is a peasant, not a government agency).
All in all, its the expected whitewash, which once again shows how the police apply different standards of justice to us than they do for themselves and their mates. This practice has been effectively endorsed by the IPCA, so they're now useless and we might as well disband them (or just rename them the "Official Police Coverup Authority" just so no-one is under any illusions about the business they're in).
The upshot: the spies are above the law. If we want justice for this, we need to change the government. We need a full, independent inquiry from people not tainted by associations with the establishment and deep state. And we need to defund and disestablish the GCSB. None of that will happen under National.