The country's spy watchdog is to investigate whether the Government Communications Security Bureau is using its interpretation of private communication to spy on New Zealanders.
It will form part of the Inspector-General of Intelligence and Security's wider inquiry into complaints about the bureau following the release of documents by the American whistleblower Edward Snowden.
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While Ms Gwyn would not respond to his specific complaint, she wrote to him saying her investigation would include looking at how the GCSB interpreted private communication and whether its collection of information raised questions about that interpretation.
While she's at it, she should look at forcing them to publish their internal legal interpretations of their powers. Because the current situation of the law effectively being secret undermines trust in the GCSB. But the big lesson from Snowden is that we cannot trust our spies; if they want to enjoy public confidence that they are behaving lawfully and in accordance with their legal mandate, they need to show us.